The professor could hardly find sufficient grounds ___________ his arguments in favor of the new theory.A.on which to baseB.which to base onC.to base onD.to be based on
The professor could hardly find sufficient grounds ___________ his arguments in favor of the new theory.
A.on which to base
B.which to base on
C.to base on
D.to be based on
B.which to base on
C.to base on
D.to be based on
参考解析
解析：考查定语从句和短语的用法。此题用了base A on B的短语，意思是“把A建立在B的基础之上(以B作为A的根据)”。其实就是to base his arguments on sufficient grounds。句意为“教授几乎找不到支持这一新理论的充分理由”。因此，在定语从句中，用which指代先行词grounds，介词on移至which前面，即 base his arguments in favor of the new theory Oil sufficient grounds=on which to base his arguments in favor of the new theory。故选A。
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