今天也看到这个题，有着和大家一样的疑问，翻阅资料后得到如下信息，欢迎大家拍砖。
首先要搞清楚是状语比较还是介宾比较还是主谓比较。
1.状语比较 都要省略前面的主谓结构，状语比较没有歧义，所以主谓没必要重复。即：如果遇到状语比较，直接比较状语部分就可以，添加主谓就是画蛇添足。
Halley's comet cause such a worldwide sensation In no other historical sighting as (it did) in its return of 1910-1911。
In no other election did Obama cause such a sensation as (he did) in his presidential race of 2008.
Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion (in this election) than (the proportion) in any previous election.（新PREP2-197 ）
Although Napoleon's army entered Russia with far more supplies
(for this campaign)than (the supplies) for any previous campaign, it had provisions for only twenty-four days.（OG10-198）
这个题就是状语比较 this year 比 last year。
2. 介宾比较 A do sth of C1 by D1 than of C2 by D2.（C1C2，D1D2对等名词）
Rice has protein of higher quality than of lower quality(介宾比较，of higher 与 of lower比）
3. 主谓比较 这个非常常见，如果前后谓语一样，直接可以省略谓语动词甚至助动词。
if you have a parallel construction involving tensed verbs, and the tensed verb is EXACTLY THE SAME in both (or all, if there are more than 2) parts of the construction, then you may omit the verb in all but the first part.
for instance:
the rain was torrential and the wind fierce.
in this case, we're allowed to omit the second 'was', because it's identical to the 'was' in the first part.
推荐牛贴 比较之庖丁解牛http://forum.chasedream.com/GMAT_SC/thread-103101-1-1.html
-- by 会员 micro418 (2010/4/13 3:08:04)
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发表于 2010-8-17 00:45:43
