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    E-shopping , when properly ,can save us a lot of time and energy . A．to do B．is done C．doing D．done 【查看更多】

     

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    E-shopping, when properly          , can save us a lot of time and energy.

    A．done          B．is done            C．having done           D．doing

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    E-shopping, when properly _____ ,can save us a lot of time and energy.

    A．doneB．doingC．to doD．is done

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    E-shopping, when properly ________, can save us a lot of time and energy．

    [　　]

    A．to do

    B．is done

    C．doing

    D．done

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    E-shopping, when properly ________ ,can save us a lot of time and energy．

    [　　]
    A．

    done

    B．

    is done

    C．

    having done

    D．

    doing

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    E-shopping, when properly ________, can save us a lot of time and energy．

    [　　]
    A．

    being done

    B．

    done

    C．

    doing

    D．

    is done

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