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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 2048

No one knew what        because of the thick fog.

A.he had happened B.had happened to him
C.had he happened D.has happened to him
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Nooneknewwhatbecauseofthethick