求问：prep187，（more than 后面啥事要补出主谓）跪求NN解答。。。

chinasharon

prep#2 --187
187
To develop more accurate population forecasts, demographers i（have to know a great deal more than now about the social and economic） determinants of fertility.
答案为D.would have to know a great deal more than they do now about the social and economic  
我在网上查看的几乎全是说：“原句是a great deal 和now在比较，所以要加they do”
还有大全的10也是：
大全10.  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.
(A) making the construction industry’s economic health much more robust than five years ago
(B) and make the construction industry’s economic health much more robust than five years ago
(C) making the construction industry’s economic health much more robust than it was five years ago
(D) to make the construction industry’s economic health much more robust than five years ago
(E) in making the construction industry’s economic health much more robust than it as five years ago
Key: C
（大全10也是补出了主谓）
但是我做到prep#2  197的时候就大大的郁闷了。。。。。。。。。。。。。。。
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.
A.    a greater proportion than it was
B.    a greater proportion than
C.    a greater proportion than they have been
D.    which is greater than was so      
E.    which is greater than it has been
（虽然别的选项我也知道哪里不对，但是它的答案是B，这个答案是在说明前两道题的答案选A也是对的！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！）
我实在是搞不明白了，求nn指教。。。。
（马上就要考试了，可能是自己的底子还是太薄了吧，正确率老是很低。。。这不知道该咋办了，求好心的nn能帮我解答这几道题，在此感激不尽）

chinasharon

没人理哇。。桑心了~~算啦，自己占个沙发吧

aeoluseros

最近我也思考了一下这个问题，感觉以前的解释不是很对，在此我把自己的想法贴上，大家一起讨论:
OG10-19. In addition to having more protein than wheat does, the protein in rice is higher quality than that in wheat, with more of the amino acids essential to the human diet.
(A) the protein in rice is higher quality than that in
(B) rice has protein of higher quality than that in
(C) the protein in rice is higher in quality than it is in
(D) rice protein is higher in quality than it is in
(E) rice has a protein higher in quality than

In this sentence, the initial clause modifies the nearest noun, identifying it as the thing being compared with wheat. By making protein the noun modified, choices A, C, and D illogically compare wheat with protein(是指In addition to having more protein than wheat does这个从句里面) and claim that the protein in rice has more protein than wheat does. In C and D, the comparative structure higher in quality than it is in wheat absurdly suggests that rice protein contains wheat. B, the best choice, logically compares wheat to rice by placing the noun rice immediately after the initial clause. B also uses that to refer to protein in making the comparison between the proteins of rice and wheat. Choice E needs either that in or does after wheat to make a complete and logical comparison.

从OG对E的解释可以看出，用than that in wheat或than does wheat都可以，但这并不能说明在其他的比较结构中也能用that in，而不是用主谓(宾)结构来与than前面的结构平行。在这个句子里：Only seven people this century have been killed by the great white shark, the man-eater of the movies—fewer than have been killed by bee stings.后面的比较成分是不可以改为less than those killed by bee stings的。具体原因如下：

在rice has a protein higher in quality than that in wheat这个句子里，比较对象是protein和that（that指代的也是protein），比较的仅仅是protein（rice has不在比较成分之内，比较的是protein的属性），所以允许平行。其实是和这个句子类似的：Today's technology allows manufacturers to make small cars that are more fuel-efficient than those at any other time in production history.

而在Only seven people this century have been killed by the great white shark, the man-eater of the movies—fewer than …中， 不仅仅Only seven people，后面的this century have been killed by the great white shark也都在比较对象里面，所以后文不能用those killed by bee stings，而应该用平行的结构than have been killed。

再比如这个句子：According to recent studies comparing the nutritional value of meat from wild animals and meat from domesticated animals, wild animals have less total fat than (that of) livestock fed on grain and more of a kind of fat thought to be good for cardiac health. 这个句子不对。其在livestock前加上that of…比较的对象是animals has less fat和that，that指代fat，而事实上比较的应该是wild animals和livestock的属性，即拥有fat的多少（注意不是比较fat的属性），所以than后面也应该用平行的句式，即主谓宾形式，不过在此省略了相同的谓语和宾语（因为不会有wild animals have livestock的歧义，只要逻辑上基本成立，GMAT并不认为所有没有补出谓语动词的形式都是”ambiguities”的）。（这个句子不对的另外一个证据： more of a kind of fat 后面省略了(than…)，而省略的部分应该和less total fat than后面的词句是一致的，这样才能省略?逻辑上看省略的必须是livestock，而不能是that of livestock，因此less total fat than后面跟的也应该是livestock。）

不过要注意一个现象，有时候省略会到让人不可思议的程度，比如只留下某个句子的成分的一部分，比如这个题只留下宾语的一个修饰成分：
According to public health officials, in 1998 Massachusetts became the first state in which more babies were born to women over the age of thirty than under it.
可以发现比较的是整句话的属性，而不仅仅是babies，而此时比较成分前后就宾语不同，那么可以就补出宾语，而宾语里相同的成分可以进一步省略，就补出宾语的修饰词。

另外：
比较的中心是什么，后面应该补出的内容就是什么：
In no other historical sighting did Halley’s comet cause such a worldwide sensation as did its return in 1910-1911.
A.    did its return in 1910-1911
B.    had its 1910-1911 return
C.    in its return of 1910-1911
D.    its return of 1910-1911 did
E.    its return in 1910-1911
key: C
比较的是前后两个句子发生时间的属性，主谓宾动词时态均一致，所以只要补出状语即可。

注意一个比较特殊的题：
2-96 There are hopeful signs that we are shifting away from our heavy reliance on fossil fuels:  more than ten times as much energy is generated through wind power now than it was in 1990.
(A) generated through wind power now than it was
(B) generated through wind power now as it was
(C) generated through wind power now as was the case
(D) now generated through wind power as it was
(E) now generated through wind power than was the case
key: C
首先这个题目因为时态的转变必须补出was，其次比较对象是整句话的属性，而不仅仅是energy，所以不用that来补出，但是却又不能用it来指代主语，所以就只能用as was the case了。

aeoluseros

prep#2 --187
187
To develop more accurate population forecasts, demographers i（have to know a great deal more than now about the social and economic） determinants of fertility.
答案为D.would have to know a great deal more than they do now about the social and economic
我在网上查看的几乎全是说：“原句是a great deal 和now在比较，所以要加they do”
还有大全的10也是：
大全10. 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.
(A) making the construction industry’s economic health much more robust than five years ago
(B) and make the construction industry’s economic health much more robust than five years ago
(C) making the construction industry’s economic health much more robust than it was five years ago
(D) to make the construction industry’s economic health much more robust than five years ago
(E) in making the construction industry’s economic health much more robust than it as five years ago
Key: C
（大全10也是补出了主谓）
这两题，我现在看来并不是因为“原句是a great deal 和now在比较，所以要加they do”：
第一题比较的是demographers和they的属性，因为时态的变化，所以前后都需要补出谓语动词，而因为谓语动词的补出，主语也必须要补出。（参见比较之庖丁解牛）
第二题的比较中如果省略了it was，那么five years ago这个状语有可能是修饰making去的。

但是我做到prep#2 197的时候就大大的郁闷了。。。。。。。。。。。。。。。
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.
A. a greater proportion than it was
B. a greater proportion than
C. a greater proportion than they have been
D. which is greater than was so
E. which is greater than it has been
（虽然别的选项我也知道哪里不对，但是它的答案是B，这个答案是在说明前两道题的答案选A也是对的！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！）
这里a greater proportion than后面依旧是可以补出it had been，that或着不补出，in any previous election已经明确是介词短语，不给使读者产生” a greater proportion”和“in any previous election”比较的歧义，所以就不需要补出了。

Gail小M

.....表示相当滴同意！

dengts

精彩！

chinasharon

太感谢版主大人啦！！！！！！！！！！！！！

wudiyeah

根据我自己曾经的总结就是：
比较级...than 直接跟 now (before) 是会有歧义的，也就是比较对象会被认为是直接与 “now”或“before”比较
但是 比较级...than +  介词短语 是可以的， 因为其实是 比较级...than (it be) +  介词短语， 符合比较结构的省略形式，比较对象的概念还是对等的

shallowshade

跪谢斑竹的精彩解释啊，后天就要考了，看过之后，醍醐灌顶啊！！！

苏格拉底屠夫

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