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

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

While building a tunnel through the mountain, ______ .

  

A.an underground lake was discovered

 

B.there was an underground lake discovered

 

C.the workers discovered an underground lake
D.a lake was discovered underground

试题答案

C

解析