题目内容

— __________ we leave the library before 5 o’clock?
— No, you needn’t. You can stay here until 5:30.
A．MustB．MayC．CanD．Could
A

试题分析：句意:-我们必须5点之前离开图书馆吗？-不，你们不必。你们可以一直呆到5点半。must 必须，它的一般疑问句的否定回答用needn’t；may 可以，一般疑问句的否定回答用mustn’t；can能，会，它的一般疑问句的否定回答用can’t；could 是can的过去式，一般疑问句的否定回答用couldn’t。故选A。
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