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题库 / Prep2012-SC-5
In Alexandria, the Ptolemys founded a library so as the written remains of Greek literature could be gathered together and systematized.
so as
in which
and
whereby
by which
题目分析：
本题中不同选项的连词在不断改变，要求考生仔细审视两个小句间的关系。
选项分析：
A选项：so as不能单独作连词。要么用于比较（和as…as…作用相仿），要么身后加不定式，即，so as to。因此，本选项在语法上不正确。
B选项：Correct. 本选项在语法和逻辑上均是正确的，即，the Ptolemys建立了某一种图书馆。请注意，in which是定语从句的关系词，先行词在定语从句中充当状语。
C选项：本选项的连词用了and，虽然在语法上合理，但是在逻辑上是有错误的。译成中文则有：
the Ptolemys建立了图书馆，并且书籍可以被整理和系统化了。
显然地，划线的两句话之间应该是因果关系，而不是并列关系。
D选项：whereby是副词而不是连词，因此其不能连接两个句子。
E选项：两个小句之间的关系没有问题，但由于by的加入，其使得a library成为了the written remains of Greek literature could be gathered together and systematized的主语（被动语态的规定，A is done by B中，B就是do的逻辑主语）。在逻辑上，图书馆不能主动发出“整理”这个动作，而只能是人“在图书馆里”整理图书。
"So as" should be followed by to + verb. It expresses the ultimate purpose of some action, usually indirectly or in potential terms.
I purchased a ladder, so as to be able to reach the highest shelves.
(Note the indirect relationship: Buying a ladder does not directly let one reach higher. First, one must actually take the ladder home, put it on the ground, and climb onto it.)
"So as to" is somewhat weird. It's not actually wrong, but I don't think GMAC would include it in an incorrect answer.
(This is not the same as so + (adjective) + as to + (verb), which is a common construction: Some of these feats are so difficult as to be nearly impossible even for the world's most accomplished athletes.
"So that" is followed by a complete sentence, expressing the purpose of something. Its meaning is a lot like that of "so as to".
Jimmy bought a ladder so that he could reach the top shelves.
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