注意：此页面搜索的是所有试题
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
A、 to be based on
B、 to base on
C、 which to base on
D、 on which to base
参考答案