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    18、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

    18、D

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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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