The professor could hardly find sufficient grounds ________ his arguments in favour of the new theory. ( 章节：1 难度：3)
- A、to be based on
- B、to base on
- C、on which to base
- D、which to base on
正确答案:C
答案解析:有
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The professor could hardly find sufficient grounds ________ his arguments in favour of the new theory. ( 章节：1 难度：3)
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