单项选择题

Gold has been highly prized throughout the ages due chiefly to

A．it is scarce
B．so scarce is it
C．its scarcity
D．scarcity of it
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单项选择题
The book ______ interesting, but it's very instructive.
A．can't be
B．may not be
C．should not be
D．might be
单项选择题
The monitor ______ ill, we'd better put the meeting off.
A．is
B．has been
C．been
D．being
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