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【题目】—Look! How clean the classroom is!

—Yes. I’m sure someone _______ it up.

A. cleans B. is cleaning C. will clean D. has cleaned

【答案】D

【解析】句意:——看,教室多么干净啊!——是啊。我确定有人打扫过了。根据句意和语境判断,现在教室很干净了,说明有人打扫过了。应该用现在完成时。故选D。

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