____ the floor, I found his pen lying on the ground.A．While sweepingB．While swep_刷题宝

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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

上一题下一题 0.64难度单项选择更新时间:2014-12-16 07:23:57

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