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题目内容
（石家庄铁道大学大学英语1）
The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.
A、 to be based on
B、 to base on
C、 which to base on
D、 on which to base
A、 to be based on
B、 to base on
C、 which to base on
D、 on which to base
参考答案