此题重点考查when和while引导的时间状语从句的基本区别。When引导的时间状语从句常用一般时态，有时也用进行时态；while引导的时间状语从句常用进行时态。亲，对我的回答满意的话，就给个好评吧。如果还有不清楚的地方，可以跟我继续交流哦。感谢你的细致回答，我的问题已经解决了，多谢大家的帮助哦！...
— You look scared. What happened?
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