2. 外语
  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 本题考查定语从句中介词前置的用法。base on的意思是“使建立在……基础上”。句中的which指代sufficient grounds，on前置。D项正确。
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