_________ the floor, I found his pen lying on the ground. A．While sweepingB．Whil
题型：不详难度：来源：
_________ 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 |
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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