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    13、He was puzzled by this phenomenon．He began to try every approach      the best way of  working it out．

    A．known finding        B．knowing to find      C．known to find D．knowing finding

    13、C

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    He was puzzled by this phenomenon．He began to try every approach      the best way of  working it out．

    A．known finding        B．knowing to find      C．known to find D．knowing finding

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