Question

【题目】—— Must I be home before eight o'clock, Mum?
—— No, you . But you have to come back before ten o'clock.
A.mustn't
B.can't
C.needn't
D.couldn't

Answer 1

【答案】C
【解析】句意：——妈妈，在八点之前，我必须回家吗？--不，你不必。但是你必须在10点之前回来。mustn't禁止；B. can't不能；C. needn't不必；D. couldn't不能。根据题意，故选C。