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
I don't think he ______ now.
A．must sleep
B．must be sleeping
C．can be sleeping
D．may sleep
单项选择题
China is a ______ with a long history.
A．nation
B．state
C．homeland
D．country
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