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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1578

Allen has decided that he will be an engineer by the time he ________ twenty.

A.had been B.is going to be
C.will be D.is
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Allenhasdecidedthathewillbeane