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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1925

They've kept up a friendship with the teacher whom they were at school _____ twenty years ago. 

A.with B.about C.since D.till
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Theyvekeptupafriendshipwiththe