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14.--Must we clean the room at once?
--No,you____.You can do it after school.(  )
A.mustn'tB.needn'tC.can't

分析 --我们必须立刻打扫房间吗?
--不,你不必.你可以放学以后打扫它.

解答 答案:B.
根据No和You can do it after school.可知下面为否定回答,must的含义是必须一定,其否定形式mustn't表示禁止的含义.在这里不是禁止的意思.must的否定回答一般可借助于needn'和don't have to来构成,表示不必.故选B.

点评 本题考查了情态动词的用法.注意must的用法以及它的肯否定形式.

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