问题

The professor could hardly find sufficientgrounds _____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

正确答案是：

同类题型

What did you think of the film? — Oh, that’s terrible I’m _____ fond of it [ ]

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I hurried _____I wouldn’t be late for class.