【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,我一小時前打掃的。根據(jù)an hour ago可知該用一般過去時,所以選C。

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