I________whilemyfriend________TV.A

发布时间：2020-07-26 09:44:27

I ________ while my friend ________ TV.A.arrived, was watchingB.was arriving, watchedC.arrived, watchedD.was arriving, was watching

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A解析while引导的从句常用进行时，主句中的动词为瞬间动词。
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