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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 977

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
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Whilebuildingatunnelthroughthe