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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
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I became a teacher 15 years ____. I have been a teacher ____ 1997.  I have taught here ___about 15 years .

A.ago , since , for B.ago , for , since
C.ago , before , for D.ago , in , after
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Ibecameateacher15years.Ihavebe