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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1613

32.So often ______ in recent years that it has almost become a rule.

A.has this happened B.this has happened
C.is this happening D.for this to happen
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相关知识点

32.Soofteninrecentyearsthatith