9. As the price of gasoline rises, which makes substituting alcohol distilled from cereal grain attractive, the prices of bread and livestock feed are sure to increase.

(A) which makes substituting alcohol distilled from cereal grain attractive

(B) which makes substituting the distillation of alcohol from cereal grain attractive

(C) which makes distilling alcohol from cereal grain an attractive substitute

(D) making an attractive substitution of alcohol distilled from cereal grain（E）

(E) making alcohol distilled from cereal grain an attractive substitute

我这题一上来就把DE排除掉了， 因为我觉得making有歧义。既可以说是前面Price rises的结果，有可以说是修饰后面the prices of bread and livestock feed ，故产生歧义。

请大家指教！

仔细又想 难道是由于GMAT中， which不能指代前面一整句话， 所以只有用making?

可making应该是As the price of gasoline rises的结果啊。明显与后面产生歧义。

这道题我也做错了..选的是D.

但这道题用WHICH肯定是不对的. MAKING的分词形式表伴随状态和结果.并不和后面产生歧意.

而E的结构好象是MAKE STH STH..比D清晰.

个人意见.