谁见过if not more so的用法？？？

843.The use of chemical pesticides in this country is equally extensive or more so than ten years ago.

(A) equally extensive or more so than ten years ago

(B) equal to or more extensive than ten years ago

(C) as extensive as ten years ago or more

(D) equal to, if not more, than ten years ago（E）

(E) as extensive as it was ten years ago, if not more so

答案是E，我狂晕。。。。if no more so算是什么用法？

楼主还没系统的复习过sc对吗?

这里as adj as, if not, more so是固定用法,而且常常是正确选项的标志

我也不知道这个结构啊 我看白勇的 怎么没有碰到。。。。

In 白勇的, it is presented in Page 10, chapter 2.

It provides the same example, but it doesn't describe how the grammar forms.... 

chris82711太强了！真羡慕你的复习进度！

as adj as, if not more so 是固定搭配。意思是不比它怎么样，也和它一样。