单项选择题

A．plans
B．reports
C．strategies
D．methods
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单项选择题
A．takenB．producedC．occurredD．recurred
A．taken
B．produced
C．occurred
D．recurred
单项选择题
A．for whichB．in whichC．to whichD．by which
A．for which
B．in which
C．to which
D．by which
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