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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
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22.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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22.Whilebuildingatunnelthrough