While building a tunnel through the mountain, ______ .A.an underground lake was discoveredB.there wa

题目简介

While building a tunnel through the mountain, ______ .A.an underground lake was discoveredB.there wa

题目详情

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
题型:单选题难度:偏易来源:不详

答案

C

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