单项选择题


A．themselves
B．itself
C．by themselves
D．of themselves
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单项选择题
A．ofB．toC．withD．at
A．of
B．to
C．with
D．at
单项选择题
A．pass onB．pass byC．pass intoD．pass off
A．pass on
B．pass by
C．pass into
D．pass off
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