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    35． made him worried. A．Not known how to do it B．Unknown what to do C．Our Knowing not how to do D．Our not knowing how to do it 【查看更多】

     

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    _________ made him worried.

    A．Not known how to do it                        B．Unknown what to do

    C．Our Knowing not how to do                    D．Our not knowing how to do it

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