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    It’s uncertain that the experiment is worth doing. 【查看更多】

     

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     It's uncertain ________ the experiment is worth doing.

    A．if

    B．that

    C．whether

    D．how

     

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    It's uncertain ________ the experiment is worth doing.

    A. if                B. that           C. whether        D. how

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    It's uncertain ________ the experiment is worth doing.

    A. if

    B. that

    C. whether

    D. how

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    It's uncertain ________ the experiment is worth doing.

    A．if B．that C．whetherD．how

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