—MustIbehomebeforeeighto'clock,Mum?—No,you

问题详情：

 —Must I be home before eight o'clock, Mum?

— No, you _____. But you have to come back before ten o'clock.

A. needn't         B. can't        C. mustn't

【回答】

A

知识点：情态动词

题型：选择题