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  3. 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.

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问题 The professor could hardly find sufficient grounds______his arguments in favor of the new theory.
选项 A、on which to base
B、which to base on
C、to base on
D、to be based on
答案A
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 on sufficient grounds=on which to base his arguments in favor of the new theory。故选A。
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