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【题目】—______ we clean our rooms first?
—No, you ______. You can do your homework first.
A.Must, mustn't
B.Must , needn't
C.Can, needn't

【答案】B
【解析】句意:—我们必须先打扫房间吗?—不,不必。你可以先做你的家庭作业。考查情态动词辨析题。can能,表示请求许可;need需要,相当于want;must必须/一定,它的一般疑问句如是否定回答,需用need+not,表示不必的意思。根据句意和语境,可知选B。

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