求助：一道语法，关于比较

quncc

Florida will gain another quarter-million jobs this year alone, many of them in (high-paying fields like electronics and banking, makeing the state's economy far more diversified than)ten years ago.

C high-paying fields such as electronics and banking, to make the state's economy far more diversified than
D such high-paying fiedls as electronics and banking, making the state's economy far more diversified than it was

为什么答案是D。不是说不能用 it  指代前面的名词吗？最起码也应换成that was。
而且C 表达的很清楚。将 (that was)一起省略，不是通用原则吗？

princess

首先C中的to make 错误，to make是表示目的
其次，因为it从逻辑上和形式上都指代the state's economy，因此it的指代是没有歧义的
不能用 it 指代前面的名词
~~~~~~~~~~~~~~~~~~~~~~~~~没有这种说法，我反倒觉得用that不好

jjjjjj

AGREE princess. 不过这道题正确答案里, it was 可以省略吗？

tongxun

我认为不应该剩，因为是与make后省略的系动结构平行的。

princess

我觉得不可以

如果补充时间状语now倒是可以考虑
makeing the state's economy far more diversified (now)than ten years ago.

jjjjjj

MAKE后省略的系动结构是什么？能具体一些吗？

tongxun

实际上句子可改为：

the state's economy is made for more diversified than it was

quncc

关于省略是我犯迷糊了。比较的时候，前后都是系表结构，gmat中通常会将后面的系动词省略。
关于it指代的问题还是不很明白。我们不是在比较中一直用that指代前面出现过的单数名词，those指代复数名词。
例如：rice has protein of higher quality than that in wheat.这里用that指代了protein.
不过，我查了一下大多数有比较的题，发现如果前后两部分都是句子，则后面的主语就是用it指代前面的主语。

越复习发现问题越多，做的很熟的题，一下子也会生出问题来，还要大家多帮忙。谢谢大家的回复了。

quncc

找到了一句我认为是省略了it was，大家看看我想的对不对。
OG/253
Analysts blamed May's luggish retail sales on unexciting merchandise as well as the weather, (colder and wetter than was usual in some regions, which slowed )sales of barbecue grills and lawn furniture.
Bis best answer
which was colder and wetter than usual in some regions, slowing
我觉得选项B的that后面就省略了it was，否则比较前后就不对称了。你们怎么看？

tongxun

现在手头没有OG，但从这个题目来看，than 后跟 was usual ，使usual的表达意思更明确。