问题补充：
Look! What a clean room! Who it ?
A. has cleaned
B. is cleaning
C. will clean
D. cleaned
答案：
(答案→)A. has cleaned
B. is cleaning
C. will clean
D. cleaned
解析：句意:看！多么干净的房间啊!谁打扫的？结合语境可知下文描述的是现在已经完成的动作，故用现在完成时态，故选A。
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