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1.-Must we clean the classroom now?
-No,you needn't.It        after school.(  )
A.may cleanB.must cleanC.need be cleanedD.can be cleaned

分析 -我现在必须打扫教室吗?
-不,不必.可以放学后打扫.

解答 答案:D
结合句子语境"我现在必须打扫教室吗?不,不必"可知It…after school表达的是允许对方在放学后打扫,允许(做某事)可用情态动词can,情态动词need在肯定句中表达"需要(做某事)"与该题表达的意思不符,故该句中确定用情态动词can;又知该句的主语it代指the classroom是谓语动词clean的承受者二者形成被动关系,故谓语动词为含有情态动词的被动语态,其结构为情态动词+be+及物动词的过去分词;套用结构故填can be cleaned,故选D

点评 本题考查含有情态动词的被动语态,首先结合语境确定恰当的情态动词,再套用该被动语态的结构(情态动词+be+及物动词的过去分词)即可选出正确答案.

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