The professor could hardly find sufficient grounds______his arguments in favour

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问题 The professor could hardly find sufficient grounds______his arguments in favour 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

答案 D

解析 base on意为“把……基于用”。which指代to base his arguments on sufficient grounds中的sufficient grounds，on前置。这句话的意思是：教授很难找到充足的理由作为其论据的基础来支持这种新的理论。因此本题的正确答案为D。

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