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    Mr Smith became a teacher in 1989. He for twenty years by next summer. A. will teach B. would have taught C. has been teaching D. will have been teaching 【查看更多】

     

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    Mr Smith became a teacher in 1989. He            for twenty years by next summer.

      A. will teach                          B. would have taught

      C. has been teaching               D. will have been teaching

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