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语法填空中while的用法什么时候用while什么时候用when?有什么区别?

题目详情
语法填空中while的用法
什么时候用while什么时候用when?有什么区别?
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答案和解析
如果你会合并下列句子,你的这个问题就OK了:
He came She was wating
1 When he came,she was waiting
2 While she was waiting,he came
3 She was waiting when he came
4 He came while she was waiting