单项选择题

The man assured himself that the bridge was safe before ______it.

A．cross
B．acrossing
C．crossing
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My grandson is totally______playing net games.
A．interested
B．uninterested in
C．interest in
单项选择题
There are ______tigers in the forest, and only a small number of monkeys.
A．a great number
B．a few of
C．a great number of
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