Mark the letter A, B,C or D on your answer sheet that completes each of the following questions or that is closest in meaning to the underlined part
If you don’t understand, don’t hesitate________.
A. ask a question
B. to ask a question
C. asking a question
D. to askin a question
Đáp án là B.
hesitate + to V: lưỡng lự, do dự ....