单项选择题

Before the students set off, they spent much time setting a limit ______ the expenses of the trip.

A．to
B．about
C．in
D．for
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单项选择题
It was so cold a night ______ we could go out.
A．that
B．but
C．what
D．as
单项选择题
When a number of people ______ together in a conversational knot, each individual expresses his position in the group where he stands.
A．pad
B．pack
C．squeeze
D．cluster
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