题目内容

When he ________ home, he saw his mother           the room.
A．got back; cleanB．got on; cleaning
C．got at; cleanD．got back; cleaning
D
考察时态，根据题意，当他回到家时，发现他的母亲正在打扫房间。可知时间状语的动作发生在过去，动名词表示正在发生的事情，伴随性的动作。故选D。
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