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    29．The professor can hardly find sufficient grounds his argument in favor of the new theory. A．which to base on B．on which to base C．to base on which D．which to be based on 【查看更多】

     

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    The professor can hardly find sufficient grounds          his argument in favor of the new theory.

    A．which to base on                                        B．on which to base

    C．to base on which                            D．which to be based on

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