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— __________ 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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