The professor can hardly find sufficient grounds______ his argument in favour of

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问题 The professor can hardly find sufficient grounds______ his argument in favour 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 句中which的先行词是grounds,不定式to base的逻辑主语是the professor,base是及物动词,全句相当于The professor can hardly find sufficient grounds on which he bases his argument in favor of the new theory.base…on(the)grounds“以……为依据建立……”。因此,无论从逻辑上还是从语义上讲,A、C、D都是不通的。另外,which是介词on的宾语,应紧跟该介词,从这个意义上讲,也应选B。
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