问题补充:
---- Look! Somebody the sofa.
---- Well, it wasn me. I didn do it.
A. is cleaning
B. was cleaning
C. has cleaned
D. cleaned
答案:
A. is cleaning
B. was cleaning
(答案→)C. has cleaned
D. cleaned
解析:句意:看,有人已经打扫了沙发。——哦,不是我。我不会做的。结合语境可知上文描述的是现在已经完成的动作,故用现在完成时态。选C。