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

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

C

解析試題分析：句意:-這個房間多么干凈�。�-是的，我確信有人打掃房間了。clean是一個動詞，意思是打掃。根據(jù)句意可知，現(xiàn)在房間非常的干凈，所以應(yīng)該是有人已經(jīng)打掃過了，故應(yīng)該用現(xiàn)在完成時，故選C。A是一般現(xiàn)在時；B是一般過去時；D是過去完成時。
考點：考查動詞時態(tài)。

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