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【题目】----Must they clean the classroom now?

----No, they ______.

A.cant B.neednt C.mustnt D.dont

【答案】B

【解析】

试题分析:句意:――他们必须现在打扫教室吗?――不他们不必。A.can’t不能,表示能力;不可能,表示否定的推测;B.needn’t不必;C.mustn’t不准,不允许,禁止;D.don’t不。must表示必须,mustnt不得,不准,不允许,neednt不必。因此,must的一般疑问句作否定回答用neednt。故选B。

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