Mark the letter A, B, C, or D on your answer sheet...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

You________plenty of time in case the bus__________; otherwise, you'll risk missing your ferry.

A. must have allowed - delays

B. ought to be allowed - has delayed

C. had better allow - is delayed

D. were allowed - was delayed