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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 318

-- Have you known each other for long?
--- No, not very long, ____ we started to study at the college.

A.when B.since C.after D.before
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Haveyouknowneachotherforlong?N