–Look!Someone

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–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

【解析】句意：——看！有人已经打扫了教室。——很好，它不是我，我没有做这件事。根据it wasn’t me, I didn’t do it.可知打扫教室这件事已经发生，根据Look！可知从此表示现在看到的结果，应是到现在为止已经发生了，并对现在造成影响，故用现在完成时。故选C。