prep+大全中关于考点not only but also.及but

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结了一下这个不起眼的语法考点，貌似一共在prep+大全中有15-20来题。放在这里给大家讨论。似乎
我总结的解题原则是：

- 在句意符合递进的关系时，not only, but （also）要求绝对的平行。之所以also用括号表示是因为also可以省略，这以现象似乎在prep种很常见。所以在解题时，看清楚句意后，只需要机械的看清楚only或者but(also)后面的内容。另外：所有的正确选项中but 与also之间尚未发现有其他的代词等。下面有几个说明：

prep.
By pressing a tiny amount of nitrogen between two diamonds to a pressure of 25 million pounds per square inch, scientists not only were able to transform the gas into a solid, but they also created a semiconductor similar to silicon.
(A) not only were able to transform the gas into a solid, but they also created
(B) not only were able to transform the gas into a solid but also creating
(C) were able not only to transform the gas into a solid but to create
(D) were able not only to transform the gas into a solid but also creating
(E) were not only able to transform the gas into a solid, but they were also able to create

这里是省略了also。其他省略掉also的还有：

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(A) the money is controlled by local school districts, but it can only be spent
(B) the money be controlled by local school districts, but it allows them to spend the money only
(C) the money is to be controlled by local school districts, but allowing it only to be spent
(D) local school districts are in control of the money, but it allows them to spend the money only
(E) local school districts are to be in control of the money, but it can only spend it

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另：关于but+it的其他题目：
prep 20.The hognose snake puts on an impressive bluff, hissing and rearing back, broadens the flesh behind its head the way a cobra does, feigning repeated strikes, but, having no dangerous fangs and no venom, eventually, if its pursuer is not cowed by the performance, will fall over and play dead.

(A) broadens the flesh behind its head the way a cobra does, feigning repeated strikes, but, having no dangerous fangs and no venom,
(B) broadens the flesh behind its head the way a cobra does and feigns repeated strikes, but with no dangerous fangs and no venom,
(C) broadening the flesh behind its head the way a cobra does and feigning repeated strikes, but it has no dangerous fangs and no venom, and
(D) broadening the flesh behind its head the way a cobra does and feigns repeated strikes, but with no dangerous fangs and no venom, and
(E) broadening the flesh behind its head the way a cobra does, feigning repeated strikes, but with no dangerous fangs and no venom, and

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- GMAC曾出现过一个非递进关系但是使用了not only but also的题目。如下：正确答案是D，去掉了not also, 只剩下but it also. 这也是第一次在SC中出现but also之间有代词的。原句是倒装句，但是正确答案改变了倒装，but后用it（it指代systematic clearing of forests）是因为but在这里是一个连词。GMACprefer后面使用完整的句子。

GWD-8-Q20:
Not only did the systematic clearing of forests in the United States create farmland (especially in the Northeast) and gave consumers relatively inexpensive houses and furniture, but it also caused erosion and very quickly deforested whole regions.

A. Not only did the systematic clearing of forests in the United States create farmland (especially in the Northeast) and gave consumers relatively inexpensive houses and furniture, but it also
B. Not only did the systematic clearing of forests in the United States create farmland (especially in the Northeast), which gave consumers relatively inexpensive houses and furniture, but also
C. The systematic clearing of forests in the United States, creating farmland (especially in the Northeast) and giving consumers relatively inexpensive houses and furniture, but also
D. The systematic clearing of forests in the United States created farmland (especially in the Northeast) and gave consumers relatively inexpensive houses and furniture, but it also
E. The systematic clearing of forests in the United States not only created farmland (especially in the Northeast), giving consumers relatively inexpensive houses and furniture, but it

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大全：The computer software being designed for a project studying Native American access to higher education will not only meet the needs of that study, but also has the versatility and power of facilitating similar research endeavors.
(A) but also has the versatility and power of facilitating
(B) but also have the versatility and power to facilitate
(C) but it also has the versatility and power to facilitate
(D) and also have the versatility and power of facilitating
(E) and it also has such versatility and power that it can facilitate

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下面是几个只十分规则的例子：

51. Gasoline marketing is undergoing major changes as stations often not only add convenience stores but also combine with major fast-food chains to build complexes where customers can shop and eat as well as buy gasoline.

(A) not only add convenience stores but also combine with major fast-food chains to build
(B) not only add convenience stores but also they combine with major fast-food chains to build
(C) are not only adding convenience stores but also in combination with major fast-food chains they build
(D) add not only convenience stores, but also combining with major fast-food chains to build
(E) are not only adding convenience stores, but also in combining with major fast-food chains they build

80. Changes in sea level are not only a result of changes in water temperature, affecting water density, but of melting glaciers as well.
(A) are not only a result of changes in water temperature, affecting water density, but of melting glaciers as well
(B) not only result from changes in water temperature, which affect water density, but also when glaciers melt
(C) are a result not only of changes in water temperature, which affect water density, but also the melting glaciers
(D) result not only from changes in water temperature, which affect water density, but also from the melting of glaciers
(E) result from not only changes in water temperature, affecting water density, but as well as when glaciers melt

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The skill and the precision of the Anasazi, ancient inhabitants of the Southwest, in measuring the movements of the Sun and Moon are evidenced not only at Chaco Canyon but at a number of other sites.

(A) in measuring the movements of the Sun and Moon is evidenced not only at
(B) in measuring the movements of the Sun and Moon are evidenced not only at
(C) in measuring the movements of the Sun and Moon is evidenced at not only
(D) to measure the movements of the Sun and Moon is evidenced at not only
(E) to measure the movements of the Sun and Moon are evidenced not only at