OG2016-SC-90 【形容词比较级】RON讲解和OG答案产生了矛盾

momoyue

Prices at the producer level are only 1.3 percent higher now than a year ago and are going down, even though floods in the Midwest and drought in the South are hurting crops and therefore raised corn and soybean prices.

这一题的正确答案是：Prices at the producer level are only 1.3 percent higher now than those of a year ago

RON之前在视频里面说过：Gas prices were higher in2007 than those in 1997中的those是多余的，应该除去。

而Gas prices in 2007 were higher than those in 1997中的those应该保留，

以此类推，这道题中的those of特应该去掉，直接： Prices at the producer level are only 1.3 percent higher now than a year ago 不是吗？

   

牛奶泡小猫

RON认为第一题的A选项中的比较结构是正确的，即比较时间状语“now”和a year ago“。
该选项的错误在与后半句的”raised“。
而B选项中的比较结构也是ok的
原帖链接：http://www.manhattanprep.com/gmat/forums/post117480.html#p117480