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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1896

During the Second World War, once before, the U-boats had been _____ because of air attack.

A.in trouble
B.in the trouble
C.for trouble
D.within trouble
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DuringtheSecondWorldWar,oncebe