单项选择题

Half of the fruit ______ bad.

A．are
B．has
C．is
D．have
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单项选择题
I saw ______ of flies on the table.
A．a group of
B．a flock of
C．a herd of
D．a drove of
单项选择题
China is a ______ with a long history.
A．nation
B．state
C．homeland
D．country
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