--- Look!Somebody the sofa.
--- Well,it wasn’t me. I didn’t do it.
A. is cleaning
B. was cleaning
C. has cleaned
D. had cleaned
网友回答
A. is cleaning
B. was cleaning
(答案→)C. has cleaned
D. had cleaned
解析：考查时态：句意：---看，沙发已经被清理干净了。---呃，不是我做的。这里强调的是过去发生的动作对现在的影响。所以要用完成时态。同时，这个过去发生的动作到说话时已经完成，而不是一直进行下去，所以用现在完成时。选C。