请教OG 11th 81题,谢谢!

OG 11th 81, In an effort to reduce their inventories, Italian vintners have cut prices; their wines have been priced to sell, and they do.请教一下，这里的THEY是指Italian vintners 或 wines of Italian vintners？ 

 AND 前后主语必须一致吗？

像这例中，如是的话指WINES， they 与前面的their指找对像不一致?

如指Italian vintners，后用DO，DO是否有嫌疑指PRICE 也可指SELL，因两者都为动词，意思一个为卖了，一个为标价了?

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Thanks a lot!