请指教

Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than it was in any previous election.

1. a greater proportion than it was
2. a greater proportion than
3. a greater proportion than they have been
4. which is greater than was so

E.which is greater than it has been

ANS:B

我怎么觉得应该是：a greater proportion than they were

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=79830&page=1

发贴标题请参考这个帖子。谢谢。

太感谢了。

i have no problem of the best answer.   my question is  why  than后面省略了proportion is possible ?

我觉得：it不能省

以保证比较结构得对称性

因为比较得是a greater proportion  in the presidential campaign of 1992和proportion  any previous election

去掉it，变成a greater proportion  和in any previous election这样一个状语相比，不对称

Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than it was in any previous election.【同位语，解释说明more than half 这个proportion，所以只需名词proportion，后面跟了个比较结构，a greater proportion  （in the presidential campaign of 1992 ）than （it＝ proportion）in any previous election】

因为逗号前句子已经全了，主语costs，谓语accounted for，宾语more than half the spending。。。，+同位语