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【单选题】
甲厂于10月4日到乙公司购买一批原料，当场提货并付款2．5万元。次日，甲厂因货物质量不合格，将这批原料退回乙公司，乙公司签收，但未退款。10月7日，甲厂到乙公司购买电器一批，价款2．8万元，提货时与乙公司约定2日内付款。2日期满，甲厂未付款，乙公司上门催收。甲厂认为前后债务相抵，只需支付3000元。双方发生争议，依据债的消灭原理，下列对此案的处理意见哪项是正确的?（ ）A.
甲厂应先付给乙公司2．8万元，再请求乙公司退款2．5万元
B.
乙公司退给甲厂2．5万元，再请求甲厂付款2．8万元
C.
甲厂付给乙公司3000元，双方了结债务
D.
甲厂应付给乙公司1．4万元，待乙公司退款之后，再付给1．4万元
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