A
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。
__________for the bus, I heard a noise, A．While waiting B．Wh
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