--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：句意为：“瞧，有人弄干净了沙发。”“嗯，那不是我。反正我没做。”根据回答，可知clean动作发生在过去。且该过去的动作对现在造成的影响是沙发干净了。所以用现在完成时态。
【考点定位】现在进行时表“此时此刻或现阶段”正发生的动作或状态。动作还没有完成。现在完成时通常表示动作在过去已完成。当然现在完成时还可表将来。