for a bus, I was reading a magazine.A. While was waitingB. While I waitingC. While I am w

for a bus, I was reading a magazine.
A. While was waiting
B. While I waiting
C. While I am waiting
D. While waiting

A. While was waitingB. While I waitingC. While I am waiting(答案→)D. While waiting解析：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。

和我的回答一样，看来我也对了

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