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    You promised your friend a letter; you ought to days ago. A. write B. be writing C. have written D. be written 【查看更多】

     

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    You promised your friend a letter; you ought to ______ days ago.

    A. write              B. be writing           C. have written    D. be written

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    You promised your friend a letter; you ought to ______ days ago.

    A．write

    B．be writing

    C．have written

    D．be written

     

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