单项选择题

There are signs ___________ restaurants are becoming more popular with families.

A．that
B．which
C．in which
D．whose
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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
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
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