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  3. The professor could hardly find sufficient grounds______ his arguments in favour of the new theory.

The professor could hardly find sufficient grounds______ his arguments in favour of the new theory.

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问题 The professor could hardly find sufficient grounds______ his arguments in favour of the new theory.
选项 A、to be based on
B、to base on
C、which to base on
D、on which to base
答案D
解析 句意：教授很难找到足够的理由作为其论点基础以支持这个新理论。本题考查定语从句。答对本题既要知道动词base的用法，又要熟悉定语从句中介词前置的用法。base sth．on sth．“以……为基础”，在本句中为to base his arguments on sufficient grounds；而which代替、修饰了sufficient grounds，同时on又前置，便形成答案D．(sufficient grounds) on which to base(his arguments)。
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