单项选择题


A．to pay
B．paying
C．pay
D．to have paid
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单项选择题
A．whichB．thatC．whatD．when
A．which
B．that
C．what
D．when
单项选择题
A．availableB．applicableC．achievableD．amenable
A．available
B．applicable
C．achievable
D．amenable
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