15.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
解析: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。
本题考查定语从句和base 一词的用法。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whatto do=whatwe shoulddo ,类比可得,此句可改成on which to base his arguments
答案:D
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