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The professor could hardil find sufficient  grounds ___

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The professor could hardil find sufficient  grounds _____hia 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
 
 答案：D为什么     说思路、
The professor could hardil find sufficient  grounds ___
这是 base A on B 句型 以乙作 甲的基础 base his arguments on sufficient grounds 以足够大理由作辩论 的根据
如果选B 的 话 应该是The professor could hardly find sufficient grounds to base his arguments on in favor of the new theory.
这是 动词不定式 作定语 与所修饰词 是动宾关系
但是 本句 on的位置不对
所以 答案是 D 其实也是不定式作定语 只不过 前面加了on which 相当于一个定语从句
=on which he based his arguments
再问： A选项有be based on这种用法吗
再答： 因为不定式to base 的逻辑主语 是句子主语 所以 应该用主动形式 作定语 与所修饰词 是动宾关系
也就是 The professor based his arguments on sufficient grounds

所以 to be based on作定语 不对 应该是 to base his arguments on
The professor could hardil find sufficient  grounds ___ The professor could hardly find sufficient grounds __his arg The professor could hardly find sufficient grounds( ) his ar 1.The professor could hardly find sufficient grounds ______ 英语翻译1,The professor could hardly find sufficient grounds on The professor could hardly find sufficient grounds on which The professor could hardly find sufficient grounds _____his 一》The professor could hardly find sufficient grounds ____ hi The professor can hardly find sufficient grounds （）his argum the professor can hardly find sufficient grounds on which to The professor could hardly find suffient grounds _______ his 英语翻译The professor could hardly find the sufficient grounds__