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
It is not the first time that I ______by him during my cooperation with him.
A．was cheated
B．am cheated
C．have been cheated
D．had been cheated
单项选择题
According to American federal government, residents of Hawaii have the longest life______: 77.2 years.
A．rank
B．scale
C．span
D．scope
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