单项选择题

I think I was at school, ___________ I was staying with a friend during the vacation when 1 heard the news.

A．or else
B．and then
C．or so
D．even so
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单项选择题
There are signs ___________ restaurants are becoming more popular with families.
A．that
B．which
C．in which
D．whose
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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