The professor could hardly find necessary grounds_______his

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The professor could hardly find necessary 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
选什么?why?

答案选 D.on which to base
句意：这位教授几乎不可能找到必需的理由,以此来支持新学说.
固定短语：base sth on sth.
原句剖析：The professor could hardly find necessary grounds（ on which to base his arguments） in favour of the new theory.划线部分为定语从句,正常语序应该是which he base his arguments on介词提前可以得到on which he base his arguments ,大家都知道宾语从句中what to do=what we should do ,类比可得,此句可改成on which to base his arguments 答案：D

The professor could hardly find necessary grounds_______his 英语翻译The professor could hardly find the sufficient grounds__ base on用法The professor could hardly find sufficient grounds_ The professor could hardly find sufficient grounds __his arg The professor could hardly find sufficient grounds( ) his ar The professor could hardly find sufficient grounds___his arg 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 The professor could hardly find sufficient grounds____his ar 一》The professor could hardly find sufficient grounds ____ hi