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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较难
  • 浏览 1826

By the time he retires, professor Baker _____ for almost forty years.

A.will have taught B.had taught
C.has taught D.is teaching
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Bythetimeheretires,professorBa