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A.examB.problemsC.checksD.tests
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A.changeB.observeC.improveD.meet
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【C4】A.changeB.alterC.varyD.differ
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【C10】A.changeB.alterC.varyD.contrast
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【C6】A.changeB.mistakeC.differenceD.mark
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【C2】A.changeB.decisionC.reductionD.relation
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【C5】A.changeB.warningC.billD.cigarettes