I was sleeping late__my friend suddenly knocked at the door填when 还是while ,说明原因,说下怎么分这两个

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Iwassleepinglate__myfriendsuddenlyknockedatthedoor填when还是while,说明原因,说下怎么分这两个Iwassleepinglate__myfrie

I was sleeping late__my friend suddenly knocked at the door填when 还是while ,说明原因,说下怎么分这两个
I was sleeping late__my friend suddenly knocked at the door
填when 还是while ,说明原因,说下怎么分这两个

I was sleeping late__my friend suddenly knocked at the door填when 还是while ,说明原因,说下怎么分这两个
when
while后面的句子一般是个持续性动作

when
when 可以表示 突发事件

when