While building a tunnel through the mountains, . [ ] A．an underground lake was discovered B．there was an underground lake discovered C．a lake was discovered underground D．the workers discovered an 题目和参考答案——青夏教育精英家教网—

题目内容

While building a tunnel through the mountains, ________.

[　　]

A．an underground lake was discovered

B．there was an underground lake discovered

C．a lake was discovered underground

D．the workers discovered an underground lake

答案：D
解析：

此题while引导的时间状语从句中省略了主语和be动词，这说明building的逻辑主语应该和主句的主语一致。选项中只有D项主语the workers可以充当building的逻辑主语，和build构成主动关系。

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