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    13．The professor could hardly find enough reasons his arguments in favor of the new theory. A．to be based on B．to base on C．which to base on D．on which to base 【查看更多】

     

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    The professor could hardly find enough reasons ____ his arguments in favor of the new theory.

    A．to be based on                                            B．to base on           

    C．which to base on                                        D．on which to base

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