单项选择题

There were some ______ flowers on the table.

A．artificial
B．unnatural
C．false
D．unreal
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单项选择题
— Be careful not to drop the Tang Dynasty vase.— Yes, we can t be ______.
A．too careful
B．very careful
C．too careless
D．careless enough
单项选择题
He was once ______ one hundred years.
A．sure that live
B．sure of living
C．certain to live
D．certain of living
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