The car hit the man _______ he was crossing the road.用when还是while其实答案是while,但我想知道原因,看了一楼的回答,我没信心了.

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The car hit the man _______ he was crossing the road.用when还是while其实答案是while,但我想知道原因,看了一楼的回答,我没信心了.
The car hit the man _______ he was crossing the road.
用when还是while
其实答案是while,但我想知道原因,看了一楼的回答,我没信心了.

The car hit the man _______ he was crossing the road.用when还是while其实答案是while,但我想知道原因,看了一楼的回答,我没信心了.
用while
while引导持续性动作