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    By the time he was ten,Edison experiments in chemistry. A.had already done B.already had done C.was already doing D.already did 【查看更多】

     

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    By the time he was ten,Edison______experiments in chemistry.

    A.had already done　　　　                             B.already had done

    C.was already doing　　　　                           D.already did

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    By the time he was ten, Edison ________ experiments in chemistry．

    [　　]
    A．

    had already done

    B．

    already had done

    C．

    was already doing

    D．

    already did

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