单项选择题

A．themselves’
B．their own’ s
C．their own
D．their
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单项选择题
A．to its best useB．for its best useC．as its best useD．in its best use
A．to its best use
B．for its best use
C．as its best use
D．in its best use
单项选择题
A．SometimesB．SometimeC．AlwaysD．Usually
A．Sometimes
B．Sometime
C．Always
D．Usually
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