单项选择题
A.in
B.of
C.for
D.to
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单项选择题
A.formalB.colloquialC.non standardD.standard
A.formal
B.colloquial
C.non standard
D.standard
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单项选择题
A.basisB.normC.ruleD.variety
A.basis
B.norm
C.rule
D.variety
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