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____ for a bus, I was reading a magazine.
A.While was waitingB.While I waitingC.While I am waitingD.While waiting
D
有些时间状语从句中的谓语动词如果有动词be,主语又与主句的主语一致,或主语是it是,则从句的主语和谓语的一部分(特别是动词be)常常可以省略。
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