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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1413

It was thirty years _______ he was invited as an outstanding alumnus to celebrate the 128th anniversary of the university.

A.as B.while
C.before D.until
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Itwasthirtyyearshewasinvitedas