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—How clean the room is!   —Yes,I am sure that someone _______ it.

A.cleans B.cleaned 
C.has cleaned D.had cleaned 

C

解析试题分析:句意:-这个房间多么干净啊!-是的,我确信有人打扫房间了。clean是一个动词,意思是打扫。根据句意可知,现在房间非常的干净,所以应该是有人已经打扫过了,故应该用现在完成时,故选C。A是一般现在时;B是一般过去时;D是过去完成时。
考点:考查动词时态。

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