The professor could hardly find sufficient grounds （）his arguments in favor of the new theory. 选项 A: to be based on B:to base on C:which to base on D: on which to base

The professor could hardly find sufficient grounds （）his arguments in favor of the new theory.
选项
A: to be based on
B:to base on
C:which to base on
D: on which to base

出自：英语语法

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