◎ 题干
用when或 while填空
1.         we were talking in the classroom, the teacher came in.
2.         they got to the airport, it was raining.
3.         she was reading a book,the phone rang.
4.         I saw the boy, he was wearing a new coat.
5.         he was reading,he fell asleep.
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◎ 解析
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◎ 知识点
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