单选题
The scientist could hardly find sufficient grounds ______ 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
【正确答案】
D
【答案解析】
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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