（）crossing the street, the old man was knocked down by a car._精华吧

（）crossing the street, the old man was knocked down by a car.

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（）crossing the street, the old man was knocked down by a car.

A.At

B.In

C.While

D.On

正确答案：While

Tag：大学英语时间：2022-01-11 14:17:25

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