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- 单项选择题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
- C
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A、to be based on
B、to base on
C、on which to base
D、which to base on
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