The professor could hardly find sufficient grounds______his arguments in favour of the new theory.

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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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