问OG149和165

149

Last year, land values in most parts of the pinelands rose almost as fast as, and in some parts even faster than, those outside the pinelands.

165

Dirt roads may evoke the bucolic simplicity of another century, but financially strained townships point out that dirt roads cost twice as much as to maintain as paved roads do.

以上两题划线部分都是正确答案。我想问一下各位大虾：

两题都是比较句型，为什么却不一样呢？如果165题把do去掉，变得跟149题差不多，那算不算对呢？谢谢各位。

楼主到置顶贴“语法知识点”查看一下，关于比较省略的问题，归纳、讨论已比较详尽