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Sales of wine have fallen _ 30% in the last ten years .A、on

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Sales of wine have fallen _ 30% in the last ten years .A、on
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Sales of wine have fallen _by_ 30% in the last ten years .A.on B.by C.to
过去的十年里,酒的销售量下降了30%.to表示“到”,后接终值,by表示“增/减”量,为原值和终值的差值或比值(%)