The professor can hardly find sufficient grounds______his argument in favor of the new theory.

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问题 The professor can hardly find sufficient grounds______his argument in favor of the new theory.

选项 A、which to base on
B、on which to base
C、to base on which
D、which to be based on

答案B

解析 本题考查定语从句的特殊用法。分析句子结构可知,空格前的句子成分完整,再结合四个选项的形式判断,空格处应为定语从句,修饰先行词grounds。动词不定式to base的逻辑主语为the professor,base是及物动词,常用于base…on(the)grounds结构,意为“以……为依据建立……”。定语从句中,“介词+which”引导的定语从句可以省略成“介词+关系代词which/whom+不定式”,故答案为[B]项。全句相当于:The professor can hardly find sufficient grounds on which he bases his argument in favor of the new theory.
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