单项选择题

It was in this library ______ I met professor Williams.

A．as
B．where
C．that
D．how
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单项选择题
The number of the tourists to these small villages ______ growing.
A．to keep
B．keep
C．keeping
D．keeps
单项选择题
You have to be very quick, ______ you'll miss the last train.
A．but
B．and
C．or
D．so
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