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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 138

A group of American soldiers were walking along the road in Irap when a bomb was _____, three of whom were killed.

A.set about
B.set out
C.set up
D.set off
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AgroupofAmericansoldierswerewa