×
单选题
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
答案解析
正确答案：D
解析：
题目解析[填写题目解析]：
答案：D
解析：这道题考查的是定语从句和固定搭配的用法。"sufficient grounds"是名词短语，在句中充当"find"的宾语。定语从句修饰"grounds"，且缺少关系代词。正确的答案是D选项："on which to base"。完整的句子是"The professor could hardly find sufficient grounds on which to base his arguments in favor of the new theory."
