单项选择题

The stone gets ______ , ______ it is exposed to the weather.

A．harder; longer
B．hard; long
C．the hardest; the longest
D．the harder; the longer
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单项选择题
Half of the fruit ______ bad.
A．are
B．has
C．is
D．have
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
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