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【题目】Look, the classroom is so clean. Someone must ________ it.

A.cleanB.have cleanedC.cleaned

【答案】B

【解析】

句意:看,教室这么干净,肯定有人打扫过。

考查现在完成时。clean是动词,意为打扫,其过去式形式为cleaned;根据Look, the classroom is so clean.可知,教室这么干净是有人打扫过以后的结果,所以使用现在完成时,其结构为have/has+动词过去分词,must是情态动词,所以此处用have cleaned。故选B

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