单项选择题

They say that the meeting will be ______.

A．of very important
B．great important
C．of great importance
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单项选择题
Of the four books I like this one______.
A．better
B．the best
C．the better
单项选择题
Their factory has developed a kind of ______to help people walk.
A．the machine
B．machines
C．machine
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