单项选择题


A．factor
B．effect
C．reason
D．element
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单项选择题
A．use toB．be used toC．used toD．had
A．use to
B．be used to
C．used to
D．had
单项选择题
A．for themselvesB．by themselvesC．themselvesD．on their own
A．for themselves
B．by themselves
C．themselves
D．on their own
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