Question

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

答案选b 什么不能选 while 请讲明原因 谢谢

Answer 1

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