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    9、_________ 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

    9、D

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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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