单项选择题

The professor could hardly find sufficient grounds ___________ his arguments in favour of the new theory.

A．to be based on
B．to base on
C．which to base on
D．on which to base

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单项选择题

I didn't know the word. I had to ___________ a dictionary.

A．look out
B．make out
C．refer to
D．go over

单项选择题

Peter, who had been driving all day, suggested ___________ at the next town.

A．to stop
B．stopping
C．stop
D．having stopped

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