（ ）the teacher came in, they were talking and laughing. A.while B.when
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你好。答案是B
合并下列句子，如果你会，你在这方面的问题就解决了：
He was getting off the bus. He fell and hurt himself
1 While he was getting off the bus,he fell and hurt himself
2 When he fell and hurt himself,he was getting off the bus
3 He was getting off the bus when he fell and hurt himself
4 He fell and hurt himself while he was getting off the bus.
5 As he got off the bus, he fell and hurt himself
6 He fell and hurt himself as he got off the bus.
简单易懂，没有长篇大论，不过你需要比较和记住。
合并下列句子，如果你会，你在这方面的问题就解决了：
He was getting off the bus. He fell and hurt himself
1 While he was getting off the bus,he fell and hurt himself
2 When he fell and hurt himself,he was getting off the bus
3 He was getting off the bus when he fell and hurt himself
4 He fell and hurt himself while he was getting off the bus.
5 As he got off the bus, he fell and hurt himself
6 He fell and hurt himself as he got off the bus.
简单易懂，没有长篇大论，不过你需要比较和记住。
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B when 引导的从句动词可以使延续性和非延续性的。
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when
助你学习进步
助你学习进步
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when 引导的时间状语从句
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when
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