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用when或 while填空 1.        

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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.
l. While   2. When   3. While   4. When   5. While