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" Must we hand in our exercise-books now?"
"No, you ____. "
A. mustn't
B. don't
C. needn't
D. can't
扩展
①mustn't 语气强“禁止”
➢You mustn't step on the grass.
②needn't 表示不必这么做,常做 must 问句的回答
➢Must I finish my homework today? No, you needn't.
③can't 不可能或不能
➢It can't be Joey. Because he is in Beiing now.
那个人不可能是Joey,因为他现在在北京。
➢问句回答时:Can I go out to play? No, you can't.
➢或做 may 问句的回答:May I sit here? No, you can't.
解析
本题答案:C
翻译:我们现在必须交练习本吗? “不,你不需要。”