The professor could hardly find sufficient grounds _____his

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The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.
The professor 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
请详解说出淘汰其他答案的依据.3ks

正确答案为 D 解析：此处为考察特殊不定式知识点和base A on B 的短语：1）特殊不定式只能用主动形式,eg:I don't know what to do next 2) on which 中的which指代sufficient grounds 3) to base 中的base 是vt .后接his argunents 做宾语 4）其实就是 base his arguments on sufficient grounds in favour of the new theory
再问：此处为什么要用which，起到什么作用
再答： which特殊疑问代词指代sufficient grounds

The professor could hardly find sufficient grounds _____his 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 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 hardil find sufficient grounds ___ The professor could hardly find suffient grounds _______ his 英语翻译The professor could hardly find the sufficient grounds__