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

题干

_________ 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:2012-01-02 12:23:14

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