题目内容：
The scientist could hardly find sufficient grounds ______ his arguments in favor of the new theory. A. which to base on
B. to base on
C.to be based on
D.on which to base
参考答案：
选择题：The scientist could hardly find sufficient grounds
- 题目分类：河南城建学院-道路桥梁与渡河工程-大学英语 3
- 题目类型：选择题
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A. which to base on
B. to base on
C.to be based on
D.on which to base