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    He didn't do well in the exam. He hard at his lessons. A. must have worked B. ought to have worked C. would have worked D. has worked 【查看更多】

     

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    He didn't do well in the exam. He ________ hard at his lessons.


    1. A.
      must have worked
    2. B.
      ought to have worked
    3. C.
      would have worked
    4. D.
      has worked

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    He didn't do well in the exam. He ________ hard at his lessons.

    [　　]

    A．must have worked
    B．ought to have worked
    C．would have worked
    D．has worked

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