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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1264

By the time Jack returned home from England, his son  _______  from college.

A.graduated B.has graduated C.had been graduating D.had graduated
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BythetimeJackreturnedhomefromE