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【题目】—Have you cleaned the room yet?

—Yes,I _______it an hour ago.

A.clean B.has cleand C.cleaned

【答案】C

【解析】

试题分析:句意:-你打扫房间了吗?是的,我一小时前打扫的根据an hour ago可知该用一般过去时,所以选C。

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