XDF-练习题-T230,“have been .., and they are”?

以下是引用eyesy在2003-9-7 16:45:00的发言：
这题应该选C，THEY ARE PRICED TO SELL，AND THEY DO （SELL）

UNFORTUNATELY， A*是错的 THEY HAVE BEEN （SELL）？

以下是引用isuffering在2003-9-7 18:18:00的发言：

WINES HAVE BEEN PRICED TO SELL, AND THEY ARE( PRICED TO SELL).
WINES HAVE BEEN PRICED TO SELL, AND THEY HAVE BEEN( PRICED TO SELL).

DO  可以指代前面整个谓语动词， 但没听说可以指代不定式的。

欢迎讨论。

以下是引用eyesy在2003-9-8 10:08:00的发言：

their wines have been priced to sell, and they are.  
  

以下是引用isuffering在2003/9/7 14:57:00的发言：
XDF-练习题-T230,“have been .., and they are”？

A
In an effort to reduce their inventories, Italian vintners have cut prices; their wines have been priced to sell, and they are.  

为了减少存量，商家降价；商家出的酒被削价去卖了，而酒的确被削价去卖了。
其中 and they are 指代 wines are priced to sell.


C

In an effort to reduce their inventories, Italian vintners have cut prices; their wines are priced to sell, and they do.

为了减少存量，商家降价；商家出的酒被降价促销，而酒的确畅销了。

其中and they do 指代wines sell.


我无法说服自己选A或是C，告诉我A或C哪里错了，为什么错？