现在在整理资料，发现对于比较重的省略越来越晕了，本来本着之前做题的原则做的题换了另一题就成不对了。我把我做的归总贴上来，大家帮我看一看吧，实在愚钝，晕在比较省略的箱子里了。
定要有可以平行比较的部分，不然不能省略
★To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
×more than now 应该改为 they do now
这里now作为状语没有与其平行的副词，所以than后面需要有成分能够与a great deal平行，不然就变成了great deal和now比较
A large rise in the number of housing starts in the coming year should boost new construction dollars by several billion dollars, making the construction industry’s economic health much more robust than five years ago. ×应该改为 it was five years ago
The animosity between those who regulate and those who are regulated has never been more pronounced than in recent debates over environmentalism and pollution control.
这里有never和in recent debates相对应，所以其他的可以省略
而现在出现这题了，正确的句子是：
Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than in any previous election.
这个句子中只是单个名词(proportion)的比较，所以不需要考虑than后面补出主谓，只补出介词短语就够了，不用担心后面的介词短语in any previou election没有平行对象
啊啊啊，谢谢，我明白了，最后一句表达不清楚也没关系了。
因为a greater proportion 是同位语，其实已经带有了 in the presidential campaign of 1992的属性，因此in any previous election是有平行的比较对象的，所以 than 之后的比较可以省略名词，只留下 in any previous election.
感觉这个题型这样看可以总结一下啦。
比较中常有的，今年的数据和往年的数据比较，或者今年的行为和往年的行为作比较。有的比较中可以省略主干只留下in any previous election，有的不能省略。重点在于，句中是否有和in previous election平行的成分。
刚才做到的GWD的一题刚好抓起来看(GWD-6-Q18)
In California today, Hispanics under the age of eighteen account for more than 43 percent, compared with a decade ago, when it was about 35 percent. 这个句子是错误的，因为没有Hispanics修饰部分和a decade ago平行（比较的是Hispanics今夕所占的proportion），因此后半句需要补充名词compared with 35% a decade ago.
但是如果是Hispanics加上一个修饰 Hispanics today under the age of...more than 43%， comapred with a decade ago... a decade ago就有相平行的成分了，因此可以省略（如果忽略35%这个内容被删除的错误）
再来一个经典的省略的
in 1998 Massachusetts became the first state in which more babies were born to women over the age of thirty than under it.
是两个proportion在比较,然后这两个proportion属于不同的时间
关于这一点我一直都很晕来着
原题：
In California today, Hispanics under the age of eighteen account for more than 43 percent, compared with a decade ago, when it was about 35 percent.
A. In California today, Hispanics under the age of eighteen account for more than 43 percent, compared with a decade ago, when it was about 35 percent.
B. Of the Californians under the age of eighteen, today more than 43 percent of them are Hispanic, compared with a decade ago, when it was about 35 percent.
C. Today, more than 43 percent of Californians under the age of eighteen are Hispanic, compared with about 35 percent a decade ago.
D. Today, compared to a decade ago, Californians who are Hispanics under the age of eighteen account for more than 43 percent, whereas it was about 35 percent.
E. Today, Hispanics under the age of eighteen in California account for more than 43 percent, unlike a decade ago, when it was about 35 percent.
你给的这到例题是典型的代指题：ABDE中的it都没有指代对象（it前根本没有单数名词可以代指）。
C中对比的对象也对等：Today, more than 43 percent of Californians under the age of eighteen vs about 35 percent a decade ago (of Californians under the age of eighteen)括号中为完全相同的部分被省略。
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发表于 2014-6-23 10:25:07
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