【題目】 Look! What a clean room! Who _______ it?

A. is cleaning B. cleaned

C. has cleaned D. cleans

【答案】C

【解析】

試題分析：句意： 看，教室多么干凈啊！誰打掃了它。句子用現(xiàn)在完成時，表示已經(jīng)發(fā)生了的事情對現(xiàn)在造成的影響，故選C。

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