The scientist could hardly find sufficient grounds ______ his arguments in favor of the new theory.

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问题 The scientist 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

答案D

解析 grounds(依据)是用来支撑arguments(观点)的,这个意思如果用动词不定式表达,应该为to base on for,如果用从句表达,应该是on which to base,所以选D。
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