问题
选择题
_________ the floor, I found his pen lying on the ground.
A．While sweeping
B．While swept
C．If sweeping
D．If swept
答案
答案：A
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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_________ the floor, I found his pen lying on the ground.
A．While sweeping
B．While swept
C．If sweeping
D．If swept
答案：A
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。