Question

【题目】— Must I be back home before 6 o'clock?— No, you ________. But don't be too late.
A.can't
B.mustn't
C.needn't
D.won't

Answer 1

【答案】C
【解析】句意：——我必须在6点前回来吗？——不，你不必，但是不要太晚。must构成的一般疑问句, 否定回答是没这个必要, 用needn't或don't have to, 故本题选C。