单项选择题


A．be
B．is
C．are
D．to be
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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
单项选择题
A．averageB．standardC．stageD．condition
A．average
B．standard
C．stage
D．condition
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