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    --We don't know_________ with this thing. It's too hard.

    --You can ask Jim for help.

    A. which to do                               B. when to do

    C. what to do.                         D. how to do

    1、C

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    --We don't know_________ with this thing. It's too hard.

    --You can ask Jim for help.

    A. which to do                               B. when to do

    C. what to do.                         D. how to do

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