【題目】—Have you cleaned the room yet？

—Yes，I _______it an hour ago.

A.clean B.has cleand C.cleaned

【答案】C

【解析】

試題分析：句意：-你打掃房間了嗎？是的，我一小時(shí)前打掃的。根據(jù)an hour ago可知該用一般過(guò)去時(shí)，所以選C。

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