—Look！Somebody the sofa.
—Well，it wasn't me.I didn't do it.(2012·江西)
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：——瞧，有人擦过沙发了。——哦，不是我，我没有擦过沙发。根据语境可知，空处表示有人已经做过某事了，故用现在完成时。