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The professor could hardly find enough grounds __his argumen

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The professor could hardly find enough grounds __his arguments in favour of the new theory.
A.to be based on
B.to base on
C.which to base on
D.on which to base
The answer to the question is D.But I don'tknow why.give me some advice please,thank you.
The professor could hardly find enough grounds __his argumen
哈哈,听了你答案就知道了.我当时也不确定是哪个.
这一句话变型：The Professor could hardly base his arguments on enough grounds in favor of the new thoery.
把enough grounds当宾语再变从句就是：enough grounds on which to base his arguments
说简单点：I put these books on the desk.
→the desk on which to put these books
不知道这样说你有没有明白~~~
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