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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 742

Only after the second tower of the World Trade Centre        did people know it was not an accident, but an attack of some kind.

A.had hit
B.did fall
C.was hit
D.was fallen
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OnlyafterthesecondtoweroftheWo