The professor could hardly find sufficient grounds __his arguments in favour of the new theory

Question

The professor could hardly find sufficient grounds __his arguments in favour of the new theory
A.on which to base B. which to base on
D. to base on D. to be based on
我知道选A，请解释一下D为什么不能选

Answer 1

be based on “以……为根据”； “根据……”；“基于……”用法是A be based on B
base on “以……为根据”，用法应是 base A on
若选D的话，语义矛盾，那就是 sufficient grounds are based on his argument，聪明的你，你觉得这句话对吗？是不是说反了、？！！

Answer 2

如果选D
the professor could hardly find sufficient grounds to be based on。。。 这里不就是完整的句子了么？ 你让后面那一大串情何以堪~ 连不上来了..

Answer 3

d 定语从句 base on的介词提前句意 教授找不出支持他新理论的根据 B base on,固定搭配，它的宾语是前面的sufficient grounds