单项选择题
A.to
B.in
C.as
D.for
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单项选择题
A.inB.ofC.forD.to
A.in
B.of
C.for
D.to
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单项选择题
A.variationB.standardizationC.unificationD.transformation
A.variation
B.standardization
C.unification
D.transformation
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