Somebody knocked at the door while I_Somebody knocked at the door while IA.started reading Bwas doing some reding 为什么选B 不选A呢?

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Somebody knocked at the door while I___Somebody knocked at the door while I__A.started reading Bwas doing some reding 为什么选B 不选A呢?
Somebody knocked at the door while I___
Somebody knocked at the door while I__
A.started reading Bwas doing some reding 为什么选B 不选A呢?

Somebody knocked at the door while I___Somebody knocked at the door while I__A.started reading Bwas doing some reding 为什么选B 不选A呢?
因为while"当.时候“是指一个时间段的,不能和终止系动词连用,而A 中的started 是终止性动词,所以不能选

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译文：正当我要开始阅读的时候，某人敲了我的门。
While引导的从句的谓语动作必须是延续性的，并强调主句和从句的动作同时发生（或者相对应）。并且while有时还可以表示对比。
例如：
While my wife was reading the newspaper, I was watching TV. (was reading是延续性的动词，was reading和was watching同时发生) 。
I like playing football while you like playing basketball.我喜欢踢足球，而你喜欢打篮球。（对比）
所以此处was doing 和前面start的时态是不对称的，所以不能选。

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