___ crossing the street ,he was knocked down by a car.选项:a、By b、During c、At d、While

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• ___ crossing the street ,he was knocked down by a car.选项:a、By b、During c、At d、While什么不能选 while 请讲明原因
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• ___ crossing the street ,he was knocked down by a car.选项:a、By b、During c、At d、While
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