单项选择题

Butter is cheap when it is plentiful, and ______ when it is in shortage.

A．costly
B．expensive
C．dear
D．priceless
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单项选择题
I do not remember ______ this book before.
A．reading
B．having ever read
C．to have ever read
D．to read
单项选择题
The writer tried to be as ______ as possible in evaluating his latest work.
A．fair
B．just
C．objective
D．uncolored
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