__________for the bus, I heard a noise,A．While waitingB．While I waitingC．I was w
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__________for the bus, I heard a noise,| A．While waiting | B．While I waiting | C．I was waiting | D．Waited |
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答案
| A |
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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