一道语法题 不明白

zhaoyiqing

In an effort to reduce their inventories, Italian vintners have cut prices; their wines have been 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

The answer is C.

为什么是补出DO的。。。而且之前为什么不和前面平行用完成时

jy03161061

我认为这里they指代的是Italian，正确逻辑应该是Italian sell wine 所以补出助动词do

至于时态问题我也想不通，不好意思