题目内容：
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
参考答案：
选择题：The professor could hardly find sufficient grounds
- 题目分类：石家庄铁道大学-土木工程-大学英语III
- 题目类型：选择题
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A、 to be based on
B、 to base on
C、 which to base on
D、 on which to base