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科目: 來(lái)源: 題型:單選題

Lin Tao has returned from the UK recently. He ______ at Cambridge for four years, during which we ______ with each other on the Internet


  1. A.
    has studied; has communicated
  2. B.
    had studied; communicated
  3. C.
    studied; had communicated
  4. D.
    studied; communicated

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