单项选择题

They stayed up late trying to ______ out a way to solve the problem.

A．let
B．give
C．knock
D．figure
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单项选择题
The buses, ______ were already full, were surrounded by an angry crowd.
A．most of which
B．both of which
C．few of them
D．those of which
单项选择题
Since 1945, the rivalry in military strength between the world's great powers has produced a ______ balanced peace.
A．contemporarily
B．predictably
C．temporarily
D．previously
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