单项选择题


A．not only
B．either
C．neither
D．both
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单项选择题
A．relatedB．relatingC．relatingD．relation
A．related
B．relating
C．relating
D．relation
单项选择题
A．criticallyB．approximatelyC．independentlyD．costly
A．critically
B．approximately
C．independently
D．costly
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