the floor, I found his pen lying on the ground. A. While sweepingB. While sweptC. If swee

发布时间:2020-08-16 20:35:29

     the floor, I found his pen lying on the ground.
A. While sweeping
B. While swept
C. If sweeping
D. If swept

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(答案→)A. While sweeping
B. While swept
C. If sweeping
D. If swept
解析:
此题考查while引导的短语作时间状语。现在分词短语表示动作正在进行。
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