og13 语法91题，哪位帮忙讲讲啊

91. In an effort to reduce their inventories, Italianvintners have cut prices; their wines havebeen priced to sell, and they are.




(A) have been priced to sell, and they are




(B) are priced to sell, and they have




(C) are priced to sell, and they do




(D) are being priced to sell, and have




(E) had been priced to sell, and they have
我貌似明白点了，这里C选项那个do是表强调么？那do后面省略的sell就是卖的好的意思？