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、for which to base
B、on which to base
C、which to be based on
D、which to base on

答案 B

解析 to base sth．on sth．else意为“把……建立在……的基础上”，介词on在本题中提到了从句句首，which为关系代词，代替前面的先行词grounds，意为“理由，根据”。

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