单项选择题
A.in
B.by
C.at
D.for
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单项选择题
A.refersB.appliesC.happensD.concerns
A.refers
B.applies
C.happens
D.concerns
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单项选择题
A.averageB.normalC.regularD.ordinary
A.average
B.normal
C.regular
D.ordinary
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