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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1317

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