单项选择题


A．This
B．That
C．It
D．Such
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单项选择题
A．changesB．modifiesC．variesD．ranges
A．changes
B．modifies
C．varies
D．ranges
单项选择题
A．hardlyB．constantlyC．occasionallyD．additionally
A．hardly
B．constantly
C．occasionally
D．additionally
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