for the bus, I heard a noise,A. While waitingB. While I waitingC. I was waitingD. Waited

发布时间：2020-08-16 15:08:52

    for the bus, I heard a noise,
A. While waiting
B. While I waiting
C. I was waiting
D. Waited

网友回答

(答案→)A. While waiting
B. While I waiting
C. I was waiting
D. Waited
解析：考查状语从句的省略式，英语中的主从句的主语一致时，可以省略从句的主语和be动词，while waiting=while I was waiting，句意是：当我等汽车的时候，我听到一生噪音。选A。
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