43. (2018宁夏)—Look! Someone ________ the classroom.
—Well, it wasn't me. I didn't do it.
A. is cleaning  B. was cleaning  
C. has cleaned   D. will clean
43. C【解析】考查现在完成时。句意“看！有人教室。”“不是我。我没有打扫。”根据语境可知此处表示：有人已经打扫了教室，用现在完成时，故选C。