—Look! Somebody the blackboard．
—Well, it wasn't me．I didn't do it．
A. is cleaning
B. was cleaning
C. had cleaned
D. has cleaned
网友回答
A. is cleaning
B. was cleaning
C. had cleaned
(答案→)D. has cleaned
解析：考查时态：句意：--看有人擦过黑板了。---哦，不是我，我没做。从句意看这句话强调的是现在黑板被擦过的结果，用现在完成时。选D。