练习册

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    Tom failed the experiment yesterday. A. doing B. did C. to do D. do 【查看更多】

     

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    Tom failed ______ the experiment yesterday.

    A. doing      B. did          C. to do       D. do

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    Tom failed ______ the experiment yesterday.

    A. doing    B. did    C. to do    D. do

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    Tom failed ______ the experiment yesterday.

    A．doing

    B．did

    C．to do

    D．do

     

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