og 129疑问

129. 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

看了以前的讨论----这里do (sell)不是强调，而是省略。sell就是前面的to sell，而补全不是do to sell, 而是do加原形。

do (to) sell不是do to sell=do sell这里加to不定式没有特别意思，只是表示动词的原形(我们单独引用一个动词原形时，习惯是to do而不仅仅说do)。这种省略在Gmat中还是比较常见的。

有些地方还是不明白，既然do (sell)不是强调,
        为什么还要用do呢？