单项选择题

The project required ten years of diligent research．（）

A．hardworking
B．basic
C．social
D．scientific

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单项选择题

Our arrangements were thrown into complete turmoil．（）

A．doubt
B．relief
C．confuision
D．failure

单项选择题

He was kept in appalling conditions in prison．（）

A．critical
B．necessary
C．normal
D．terrible

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