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5 tháng 1 2022

9C                                                     13D

10A                                                   14A

11B                                                   15A

12A                                    ĐÚNG KO TICK CHO EM NHA

5 tháng 1 2022

9. He fell down when he ______ towards the church.

A. run

B. runs

C. was running

D. had run

10. We _______ there when our father died.

A. still lived

B. lived still

C. was still lived

D. was still living

11. They ______ table tennis when their father comes back home.

A. will play

B. will be playing

C. play

D. would play

12. By Christmas, I _______ for Mr. Smith for six years.

A. will have been working

B. will work

C. have been working

D. will be working

13. I _______ in the room right now

A. am being

B. was being

C. have been being

D. am

14. I ______ to New York three times this year.

A. have been

B. was

C. were

D. had been

15. I’ll come and see you before I _______ for the States.

A. leave

B. will leave

C. have left

D. shall leave

11 tháng 1 2017

6.I ______ Texas State University now.

A.am attending B. attend

C.was attending D. attended

7.He has been selling motorbikes ________.

A.ten years ago B. since ten years C. for ten years ago D. for ten years

8.Christopher Columbus _______ American more than 500 years ago.

A.discovered B. has discovered C. had discovered D. had been discovering

9.He fell down when he ______ towards the church.

A.run B. runs C. was running D. had run

10.We _______ there when our father died.

A.still lived B. lived still C. was still lived D. was still living

1. When I last saw him, he _____ in London. A. has lived B. is living C. was living D. has been living 2. We _______ Dorothy since last Saturday. A. don't see B. haven't seen C. didn't see D. hadn't seen 3. The train ______ half an hour ago. A. has been leaving B. left C. has left D. had left 4. Jack ______ the door. A. has just painted B. paint C. will have painted D. painting 5. My sister ________ for you since yesterday. A. is looking B. was looking C. has been looking D. looked 6....
Đọc tiếp

1. When I last saw him, he _____ in London.

A. has lived B. is living C. was living D. has been living

2. We _______ Dorothy since last Saturday.

A. don't see B. haven't seen C. didn't see D. hadn't seen

3. The train ______ half an hour ago.

A. has been leaving B. left C. has left D. had left

4. Jack ______ the door.

A. has just painted B. paint C. will have painted D. painting

5. My sister ________ for you since yesterday.

A. is looking B. was looking C. has been looking D. looked

6. I ______ Texas State University now.

A. am attending B. attend

C. was attending D. attended

7. He has been selling motorbikes ________.

A. ten years ago B. since ten years

C. for ten years ago D. for ten years

8. Christopher Columbus _______ American more than 500 years ago.

A. discovered B. has discovered

C. had discovered D. had been discovering

9. He fell down when he ______ towards the church.

A. run B. runs C. was running D. had run

10. We _______ there when our father died.

A. still lived B. lived still C. was still lived D. was still living

2
31 tháng 3 2020

1. When I last saw him, he _____ in London.

A. has lived B. is living C. was living D. has been living

2. We _______ Dorothy since last Saturday.

A. don't see B. haven't seen C. didn't see D. hadn't seen

3. The train ______ half an hour ago.

A. has been leaving B. left C. has left D. had left

4. Jack ______ the door.

A. has just painted B. paint C. will have painted D. painting

5. My sister ________ for you since yesterday.

A. is looking B. was looking C. has been looking D. looked

6. I ______ Texas State University now.

A. am attending B. attend

C. was attending D. attended

7. He has been selling motorbikes ________.

A. ten years ago B. since ten years

C. for ten years ago D. for ten years

8. Christopher Columbus _______ American more than 500 years ago.

A. discovered B. has discovered

C. had discovered D. had been discovering

9. He fell down when he ______ towards the church.

A. run B. runs C. was running D. had run

10. We _______ there when our father died.

A. still lived B. lived still C. was still lived D. was still living

31 tháng 3 2020

1. When I last saw him, he _____ in London.

A. has lived B. is living C. was living D. has been living

2. We _______ Dorothy since last Saturday.

A. don't see B. haven't seen C. didn't see D. hadn't seen

3. The train ______ half an hour ago.

A. has been leaving B. left C. has left D. had left

4. Jack ______ the door.

A. has just painted B. paint C. will have painted D. painting

5. My sister ________ for you since yesterday.

A. is looking B. was looking C. has been looking D. looked

6. I ______ Texas State University now.

A. am attending B. attend

C. was attending D. attended

7. He has been selling motorbikes ________.

A. ten years ago B. since ten years

C. for ten years ago D. for ten years

8. Christopher Columbus _______ American more than 500 years ago.

A. discovered B. has discovered

C. had discovered D. had been discovering

9. He fell down when he ______ towards the church.

A. run B. runs C. was running D. had run

10. We _______ there when our father died.

A. still lived B. lived still C. was still lived D. was still living

Exercise 11 Choose the best answer among A, B, C, or D. 1. When I last saw him, he _____ in London. A. has lived B. is living C. was living D. has been living 2. We _______ Dorothy since last Saturday. A. don't see B. haven't seen C. didn't see D. hadn't seen 3. The train ______ half an hour ago. A. has been leaving B. left C. has left D. had left 4. Jack ______ the door. A. has just painted B. paint C. will have painted D. painting 5. My sister ________ for you since yesterday. A....
Đọc tiếp

Exercise 11

Choose the best answer among A, B, C, or D.

1. When I last saw him, he _____ in London.

A. has lived B. is living C. was living D. has been living

2. We _______ Dorothy since last Saturday.

A. don't see B. haven't seen C. didn't see D. hadn't seen

3. The train ______ half an hour ago.

A. has been leaving B. left C. has left D. had left

4. Jack ______ the door.

A. has just painted B. paint C. will have painted D. painting

5. My sister ________ for you since yesterday.

A. is looking B. was looking C. has been looking D. looked

6. I ______ Texas State University now.

A. am attending B. attend

C. was attending D. attended

7. He has been selling motorbikes ________.

A. ten years ago B. since ten years C. for ten years ago D. for ten years

8. Christopher Columbus _______ American more than 500 years ago.

A. discovered B. has discovered C. had discovered D. had been discovering

9. He fell down when he ______ towards the church.

A. run B. runs C. was running D. had run

10. We _______ there when our father died.

A. still lived B. lived still C. was still lived D. was still living

5
31 tháng 12 2016

1. When I last saw him, he _____ in London.

A. has lived B. is living C. was living D. has been living

2. We _______ Dorothy since last Saturday.

A. don't see B. haven't seen C. didn't see D. hadn't seen

3. The train ______ half an hour ago.

A. has been leaving B. left C. has left D. had left

4. Jack ______ the door.

A. has just painted B. paint C. will have painted D. painting

5. My sister ________ for you since yesterday.

A. is looking B. was looking C. has been looking D. looked

6. I ______ Texas State University now.

A. am attending B. attend

C. was attending D. attended

7. He has been selling motorbikes ________.

A. ten years ago B. since ten years C. for ten years ago D. for ten years

8. Christopher Columbus _______ American more than 500 years ago.

A. discovered B. has discovered C. had discovered D. had been discovering

9. He fell down when he ______ towards the church.

A. run B. runs C. was running D. had run

10. We _______ there when our father died.

A. still lived B. lived still C. was still lived D. was still living

31 tháng 12 2016

Exercise 11

Choose the best answer among A, B, C, or D.

1. When I last saw him, he _____ in London.

A. has lived B. is living C. was living D. has been living

2. We _______ Dorothy since last Saturday.

A. don't see B. haven't seen C. didn't see D. hadn't seen

3. The train ______ half an hour ago.

A. has been leaving B. left C. has left D. had left

4. Jack ______ the door.

A. has just painted B. paint C. will have painted D. painting

5. My sister ________ for you since yesterday.

A. is looking B. was looking C. has been looking D. looked

6. I ______ Texas State University now.

A. am attending B. attend C. was attending D. attended

7. He has been selling motorbikes ________.

A. ten years ago B. since ten years C. for ten years ago D. for ten years

8. Christopher Columbus _______ American more than 500 years ago.

A. discovered B. has discovered C. had discovered D. had been discovering

9. He fell down when he ______ towards the church.

A. run B. runs C. was running D. had run

10. We _______ there when our father died.

A. still lived B. lived still C. was still lived D. was still living

9/ He fell down when he ___ towards the church. A. Run B. runs C. Was running D. Had run 10/ We __ there when our father died. A. still lived B. lived still C. Was still lived D. was still living 11/ They __ table tennis when their father comes back home. A. will play B. will be playing C. play D. would play 12/ By Christmas, I __ for Mr. Smith for six years A. will have been working B. was being C. have been working D. will be working 13/ I __ in the room right now. A. am being B. was...
Đọc tiếp

9/ He fell down when he ___ towards the church.

A. Run B. runs C. Was running D. Had run

10/ We __ there when our father died.

A. still lived B. lived still C. Was still lived D. was still living

11/ They __ table tennis when their father comes back home.

A. will play B. will be playing C. play D. would play

12/ By Christmas, I __ for Mr. Smith for six years

A. will have been working B. was being C. have been working D. will be working

13/ I __ in the room right now.

A. am being B. was being C. have been being D.am

14/ I __ to New York three times this year

A.have been B. was C.were D. had been

15/ I'll come and see you before I __ for the States

A. leave B. will leave C.have left D. shall leave

16/ The little girl asked what __ to her friend

A. has happened B. happened

17/ John __ a book when i saw him

A. is reading B. read C. was reading D. reading

18/ He said he __return later

A.will B.would C.can D.would be

19/ Jack __ the door.

A.has just opened B. open C.have opened D.opening

20/ I have been waiting for you __

A. since early morning

B. since 9.am

C. for two hours

D. All are correct

21/ Almost everyone ___ for home by the time we arrived

A. leave B. left C. leaves D. had left

22/ By the age of 25, he ___ two famous novels

A. wrote B. writes C. has written D. had written

23/ When her husband was in the army, Mary ___ to him twice a week

A. was reading B. wrote C. was written D. had written

24/ I couldn't cut the grass because the lawn mower ___ a few days previously

A. broke down B. has been broken

@Dương Yến Tử giúp em vs...!!

Ai biết làm các câu này giúp mình với nha. Thanks!!

1
8 tháng 9 2017

9/ He fell down when he ___ towards the church.

A. Run B. runs C. Was running D. Had run

10/ We __ there when our father died.

A. still lived B. lived still C. Was still lived D. was still living

11/ They __ table tennis when their father comes back home.

A. will play B. will be playing C. play D. would play

12/ By Christmas, I __ for Mr. Smith for six years

A. will have been working B. was being C. have been working D. will be working

13/ I __ in the room right now.

A. am being B. was being C. have been being D.am

14/ I __ to New York three times this year

A.have been B. was C.were D. had been

15/ I'll come and see you before I __ for the States

A. leave B. will leave C.have left D. shall leave

16/ The little girl asked what __ to her friend

A. has happened B. happened

17/ John __ a book when i saw him

A. is reading B. read C. was reading D. reading

18/ He said he __return later

A.will B.would C.can D.would be

19/ Jack __ the door.

A.has just opened B. open C.have opened D.opening

20/ I have been waiting for you __

A. since early morning

B. since 9.am

C. for two hours

D. All are correct

21/ Almost everyone ___ for home by the time we arrived

A. leave B. left C. leaves D. had left

22/ By the age of 25, he ___ two famous novels

A. wrote B. writes C. has written D. had written

23/ When her husband was in the army, Mary ___ to him twice a week

A. was reading B. wrote C. was written D. had written

24/ I couldn't cut the grass because the lawn mower ___ a few days previously

A. broke down B. has been broken

=> had broken down

1. When I last saw him, he _____ in London. A. has lived B. is living C. was living D. has been living 2. We _______ Dorothy since last Saturday. A. don't see B. haven't seen C. didn't see D. hadn't seen 3. The train ______ half an hour ago. A. has been leaving B. left C. has left D. had left 4. Jack ______ the door. A. has just painted B. paint C. will have painted D. painting 5. My sister ________ for you since yesterday. A. is looking B. was looking C. has been looking D. looked 6. I ______...
Đọc tiếp

1. When I last saw him, he _____ in London.
A. has lived B. is living C. was living D. has been living
2. We _______ Dorothy since last Saturday.
A. don't see B. haven't seen C. didn't see D. hadn't seen
3. The train ______ half an hour ago.
A. has been leaving B. left C. has left D. had left
4. Jack ______ the door.
A. has just painted B. paint C. will have painted D. painting
5. My sister ________ for you since yesterday.
A. is looking B. was looking C. has been looking D. looked
6. I ______ Texas State University now.
A. am attending B. attend
C. was attending D. attended
7. He has been selling motorbikes ________.
A. ten years ago B. since ten years
C. for ten years ago D. for ten years
8. Christopher Columbus _______ American more than 500 years ago.
A. discovered B. has discovered
C. had discovered D. had been discovering
9. He fell down when he ______ towards the church.

A. run B. runs C. was running D. had run
10. We _______ there when our father died.
A. still lived B. lived still C. was still lived D. was still living
11. They ______ table tennis when their father comes back home.
A. will play B. will be playing C. play D. would play
12. By Christmas, I _______ for Mr. Smith for six years.
A. will have been working B. will work
C. have been working D. will be working
13. I _______ in the room right now.
A. am being B. was being
C. have been being D. am
14. I ______ to New York three times this year.
A. have been B. was C. were D. had been
15. I'll come and see you before I _______ for the States.
A. leave B. will leave C. have left D. shall leave
16. The little girl asked what _______ to her friend.
A. has happened B. happened
C. had happened D. would have been happened

***Nhanh nhé mk đang cần gấp!!!

0
11 tháng 8 2019

Choose the correct option.

1. He joined the company 25 years ago and he still works for us.

2. What did they do at 11pm last night - it was really noisy?

3. My parents have lived in Berlin for ten years. They lived there when the Berlin Wall came down in 1999.

4. As soon as I saw the accident I was calling the police

5. When the teacher said ‘Stop!’, I still tried to finish the last question.

11 tháng 8 2019

Choose the correct option.

1. He joined/was joining the company 25 years ago and he still works for us.

2. What did they do/were they doing at 11pm last night - it was really noisy?

3. My parents lived/were living -> has been living/ has lived in Berlin for ten years. They lived/were living there when the Berlin Wall came down in 1999.

4. As soon as I saw/was seeing the accident I called/was calling the police

5. When the teacher said/was saying ‘Stop!’, I still tried/was still trying to finish the last question.

1. I .......... Louisiana state University. A. am attending B. attend C. was attending D attended 2. He has been selling motorcycles ................................. A. ten years ago B. since ten years C. for ten years ago D. for ten years 3. Columbus ..................... America more than 400 years ago. A. discovered B. has discovered C. had discovers D. he has gone 4. He fell down when he .................... towards the church. A. run B. runs C. was running D. were running 5. We...
Đọc tiếp

1. I .......... Louisiana state University.

A. am attending B. attend C. was attending D attended

2. He has been selling motorcycles .................................

A. ten years ago B. since ten years C. for ten years ago D. for ten years

3. Columbus ..................... America more than 400 years ago.

A. discovered B. has discovered C. had discovers D. he has gone

4. He fell down when he .................... towards the church.

A. run B. runs C. was running D. were running

5. We ............. there when our father died.

A. still lived B. lived still C. was still living D. were still living

6. They ................ pingpong when their father comes back home.

A. will play B. will be playing C. play D. would play

7. By Christmas, I ...................... for you for 6 months.

A. shall have been working B. shal work C. have been working D. shall be working

8. I ............... in the room now.

A. am being B. was being C. have been being

9. I ........................ to New York three times this year.

A. have been B. was C. were D. had been

10. I will come and see you before I ................ for America.

A. leave B. will leave C. have left D. shall leave

11. The little girl asked what .................. to her friend.

A. has happened B. happened C. had happened D. would have been happened

12. John ............... a book when I saw him.

A. is reading B. read C. was reading D. reading

13. He said he ................. return later.

A. will B. would C. can D. would be

14. Jack ...................... the door.

A. has just opened B. open C. will have opened D. opening

15. I have been waiting for you ...................

A. since early morning B. for two hours C. since 9 a.m D. all are correct

16. My sister ..................... for you since yesterday.

A. is looking B. was looking C. has been looking D. looked

2
13 tháng 7 2017

1. I .......... Louisiana state University.

A. am attending B. attend C. was attending D attended

2. He has been selling motorcycles .................................

A. ten years ago B. since ten years C. for ten years ago D. for ten years

3. Columbus ..................... America more than 400 years ago.

A. discovered B. has discovered C. had discovers D. he has gone

4. He fell down when he .................... towards the church.

A. run B. runs C. was running D. were running

5. We ............. there when our father died.

A. still lived B. lived still C. was still living D. were still living

6. They ................ pingpong when their father comes back home.

A. will play B. will be playing C. play D. would play

7. By Christmas, I ...................... for you for 6 months.

A. shall have been working B. shal work C. have been working D. shall be working

8. I ......am......... in the room now.

A. am being B. was being C. have been being

9. I ........................ to New York three times this year.

A. have been B. was C. were D. had been

10. I will come and see you before I ................ for America.

A. leave B. will leave C. have left D. shall leave

11. The little girl asked what .................. to her friend.

A. has happened B. happened C. had happened D. would have been happened

12. John ............... a book when I saw him.

A. is reading B. read C. was reading D. reading

13. He said he ................. return later.

A. will B. would C. can D. would be

14. Jack ...................... the door.

A. has just opened B. open C. will have opened D. opening

15. I have been waiting for you ...................

A. since early morning B. for two hours C. since 9 a.m D. all are correct

16. My sister ..................... for you since yesterday.

A. is looking B. was looking C. has been looking D. looked

28 tháng 9 2021

 

Chọn đáp án đúng nhất 1.When I last saw him, he _____ in London. A.has lived B. is living C. was living D. has been living 2.We _______ Dorothy since last Saturday. A.don’t see B. haven’t seen C. didn’t see D. hadn’t seen 3.The train ______ half an hour ago. A.has been leaving B. left C. has left D. had left 4.Jack ______ the door. A.has just painted B. paint C. will have painted D. painting 5.My sister ________ for you since yesterday. A.is looking B. was looking C. has been...
Đọc tiếp

Chọn đáp án đúng nhất

1.When I last saw him, he _____ in London.

A.has lived B. is living C. was living D. has been living

2.We _______ Dorothy since last Saturday.

A.don’t see B. haven’t seen C. didn’t see D. hadn’t seen

3.The train ______ half an hour ago.

A.has been leaving B. left C. has left D. had left

4.Jack ______ the door.

A.has just painted B. paint C. will have painted D. painting

5.My sister ________ for you since yesterday.

A.is looking B. was looking C. has been looking D. looked

6.I ______ Texas State University now.

A.am attending B. attend

C.was attending D. attended

7.He has been selling motorbikes ________.

A.ten years ago B. since ten years C. for ten years ago D. for ten years

8.Christopher Columbus _______ American more than 500 years ago.

A.discovered B. has discovered C. had discovered D. had been discovering

9.He fell down when he ______ towards the church.

A.run B. runs C. was running D. had run

10.We _______ there when our father died.

A.still lived B. lived still C. was still lived D. was still living

11.They ______ table tennis when their father comes back home.

A.will play B. will be playing C. play D. would play

12.By Christmas, I _______ for Mr. Smith for six years.

A.will have been working B. will work C. have been working D. will be working

13.I _______ in the room right now.

A.am being B. was being C. have been being D. am

14.I ______ to New York three times this year.

A.have been B. was C. were D. had been

15.I’ll come and see you before I _______ for the States.

A.leave B. will leave C. have left D. shall leave

bài nãy nữa, còn nhiều lắm, chịu khó giúp tớ nha

3
2 tháng 3 2017

1.When I last saw him, he _____ in London.

A.has lived B. is living C. was living D. has been living

2.We _______ Dorothy since last Saturday.

A.don’t see B. haven’t seen C. didn’t see D. hadn’t seen

3.The train ______ half an hour ago.

A.has been leaving B. left C. has left D. had left

4.Jack ______ the door.

A.has just painted B. paint C. will have painted D. painting

5.My sister ________ for you since yesterday.

A.is looking B. was looking C. has been looking D. looked

6.I ______ Texas State University now.

A.am attending B. attend

C.was attending D. attended

7.He has been selling motorbikes ________.

A.ten years ago B. since ten years C. for ten years ago D. for ten years

8.Christopher Columbus _______ American more than 500 years ago.

A.discovered B. has discovered C. had discovered D. had been discovering

9.He fell down when he ______ towards the church.

A.run B. runs C. was running D. had run

10.We _______ there when our father died.

A.still lived B. lived still C. was still lived D. was still living

11.They ______ table tennis when their father comes back home.

A.will play B. will be playing C. play D. would play

12.By Christmas, I _______ for Mr. Smith for six years.

A.will have been working B. will work C. have been working D. will be working

13.I _______ in the room right now.

A.am being B. was being C. have been being D. am

14.I ______ to New York three times this year.

A.have been B. was C. were D. had been

15.I’ll come and see you before I _______ for the States.

A.leave B. will leave C. have left D. shall leave

2 tháng 3 2017

Chọn đáp án đúng nhất

1.When I last saw him, he _____ in London.

A.has lived B. is living C. was living D. has been living

2.We _______ Dorothy since last Saturday.

A.don’t see B. haven’t seen C. didn’t see D. hadn’t seen

3.The train ______ half an hour ago.

A.has been leaving B. left C. has left D. had left

4.Jack ______ the door.

A.has just painted B. paint C. will have painted D. painting

5.My sister ________ for you since yesterday.

A.is looking B. was looking C. has been looking D. looked

6.I ______ Texas State University now.

A.am attending B. attend

C.was attending D. attended

7.He has been selling motorbikes ________.

A.ten years ago B. since ten years C. for ten years ago D. for ten years

8.Christopher Columbus _______ American more than 500 years ago.

A.discovered B. has discovered C. had discovered D. had been discovering

9.He fell down when he ______ towards the church.

A.run B. runs C. was running D. had run

10.We _______ there when our father died.

A.still lived B. lived still C. was still lived D. was still living

11.They ______ table tennis when their father comes back home.

A.will play B. will be playing C. play D. would play

12.By Christmas, I _______ for Mr. Smith for six years.

A.will have been working B. will work C. have been working D. will be working

13.I _______ in the room right now.

A.am being B. was being C. have been being D. am

14.I ______ to New York three times this year.

A.have been B. was C. were D. had been

15.I’ll come and see you before I _______ for the States.

A.leave B. will leave C. have left D. shall leave

1. When I last saw him, he _____ in London. A. has lived B. is living C. was living D. has been living 2. We _______ Dorothy since last Saturday. A. don’t see B. haven’t seen C. didn’t see D. hadn’t seen 3. The train ______ half an hour ago. A. has been leaving B. left C. has left D. had left 4. Jack ______ the door. A. has just painted B. paint C. will have painted D. painting 5. My sister ________ for you since yesterday. A. is looking B. was looking C. has been looking D. looked 6....
Đọc tiếp

1. When I last saw him, he _____ in London.

A. has lived B. is living C. was living D. has been living

2. We _______ Dorothy since last Saturday.

A. don’t see B. haven’t seen C. didn’t see D. hadn’t seen

3. The train ______ half an hour ago.

A. has been leaving B. left C. has left D. had left

4. Jack ______ the door.

A. has just painted B. paint C. will have painted D. painting

5. My sister ________ for you since yesterday.

A. is looking B. was looking C. has been looking D. looked

6. I ______ Texas State University now.

A. am attending B. attend C. was attending D. attended

7. He has been selling motorbikes ________.

A. ten years ago B. since ten years C. for ten years ago D. for ten years

8. Christopher Columbus _______ American more than 500 years ago.

A. discovered B. has discovered C. had discovered D. had been discovering

9. He fell down when he ______ towards the church.

A. run B. runs C. was running D. had run

10. We _______ there when our father died.

A. still lived B. lived still C. was still lived D. was still living

11. They ______ table tennis when their father comes back home.

A. will play B. will be playing C. play D. would play

12. By Christmas, I _______ for Mr. Smith for six years.

A. will have been working B. will work C. have been working D. will be working

13. I _______ in the room right now

A. am being B. was being C. have been being D. am

14. I ______ to New York three times this year.

A. have been B. was C. were D. had been

15. I’ll come and see you before I _______ for the States.

A. leave B. will leave C. have left D. shall leave

16. The little girl asked what _______ to her friend.

A. has happened B. happened C. had happened D. would have been happened

17. John ______ a book when I saw him.

A. is reading B. read C. was reading D. reading

18. He said he _______ return later.

A. will B. would C. can D. would be

19. Jack ________ the door.

A. has just opened B. open C. have opened D. opening

20. I have been waiting for you ______ .

A. since early morning B. since 9 a.m

C. for two hours D. All are correct

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10 tháng 10 2019

1. C

2. B

3. B

4. A

5. C

6. A

7. D

8. A

9. C

10. A

11. B

12. A

13. D

14. A

15. A

16. C

17. C

18. B

19. A

20. D