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【C8】A.preventB.requireC.assistD.forbid
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A.showB.requireC.collectD.discover
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【C13】A.spendB.costC.consumeD.waste
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【C15】A.spendB.investC.detectD.test
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【C4】A.experiencesB.possessesC.encountersD.retains
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【S4】A.spendB.useC.takeD.consume
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_________(53)A.spend B.requireC.settle D.remain