___ crossing the street ,he was knocked down by a car.选项:a、B

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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

While crossing the street ,he - -- - - -
答案是while,不是during.你的句子是分词结构,可以改写成：while he was crossing the street,he - - -- - -
在分词结构里面,你的句子是while+现在分词.记住,during+名词短语.所以B是错误的选项.
又如
While( he was) staying in Shanghai,he visited me
===During his stay in Shanghai,he visited me
记住：while+ 现在分词,during+名词短语

___ crossing the street ,he was knocked down by a car.选项:a、B the old man was knocked down by a taxi when he was crossing he was knocked down(when crossing the street). 英语问题 He was knocked down by a car He was knocked down by a car and badly ________.A.injured B. The old man was knocked down by a car [ ]he saw it run towar he was crossing the street when a car ___ at that momnent The man down by a car was dying.A knock B knocking C knocked ----------（lucky),my friend ,Peter,was knocked down by a car 单选:She was knocked down by a car and her shouts ____ the att The old lady was knocked down by a car when she walked on th ①John had an a____:he's been knocked down by a car.②the foot