题干

The professor could hardly find sufficient grounds________ his arguments in favor of the new theory.

A:on which to base

B:which to base o

C:to base o

D:to be based o

上一题 下一题 0.0难度 选择题 更新时间:2012-06-30 05:31:36

答案(点此获取答案解析)

A