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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1976

I often think of those occasions ______ we had a happy time together.

A.which B.when
C.on which D.Both B and C
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Ioftenthinkofthoseoccasionsweh