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

此題考查while引導(dǎo)的短語(yǔ)作時(shí)間狀語(yǔ)�，F(xiàn)在分詞短語(yǔ)表示動(dòng)作正在進(jìn)行。
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