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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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