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While building a tunnel through the mountain, A．an underground lake was discover

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While building a tunnel through the mountain, A．an underground lake was discover

While building a tunnel through the mountain, ________

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

 

试题答案

答案：D

提示：
前面用到了分词，说明主句和从句的主语一致，四个选项中只有worker可以和build相配

 

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