单项选择题
A.variation
B.standardization
C.unification
D.transformation
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单项选择题
A.talkedB.concernedC.mentionedD.involved
A.talked
B.concerned
C.mentioned
D.involved
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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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