自己也分析总结了一下，分享给你。 希望能有所帮助
37. Although schistosomiasis is not often fatal, it is so debilitating that it has become an economic drain on many developing countries.
(A) it is so debilitating that it has become an economic
(B) it is of such debilitation, it has become an economical
(C) so debilitating is it as to become an economic
(D) such is its debilitation, it becomes an economical
(E) there is so much debilitation that it has become an economical
重要：
——rabbit：问题又出在了C的身上。考虑多重因素认为C不对。
第一，也是本题最为重要的，so as to 表明的其后动作的时态是与主句一致的，也就是 it becomes an economic drain，然而在A选项中表明了用现在完成时——表示变化及过程的作用——从而选择C错误。
第二，可以通过大平行来排除C选项，因为从句中采用的主动语态，而主句中尽量平行——显然没有必要非常强调debilitating——以保持美观优雅。
第三，参考baby姐的说法，即so as to 后面最好接表示状态的动词，例如系动词，而最好不要接动作性动词。
in general, you don't use so ADJ as to VERB unless the VERB describes some sort of state/condition. i.e., if the verb is an action verb, this construction generally isn't used.
for instance,
i am so ugly as to be viscerally repulsive to women. --> this works, because the verb “to be” describes a state/condition.
i am so ugly as to repel women on sight. --> you generally wouldn't see this in good writing, as “repel” is an action verb; the sentence would probably be written as i am so ugly that i repel women on sight.
RON的说法挺认可的：
The Emperor Augustus, it appears, commissioned an idealized sculptured portrait, the features of which are so unrealistic as to constitute what one scholar calls an “artificial face.”
so unrealistic as to constitute[相当于be ]
so unrealistic they constituted
so unrealistic that they have constituted
unrealistic enough so that they constitute（A）
unrealistic enough so as to constitute
constitute可以做linking verb，也可以做transitive verb，在本题是linking verb.
[linking verb, not in progressive] to be considered to be something Failing to complete the work constitutes a breach of the employment contract. The rise in crime constitutes a threat to society.
简言之，So as to XX，其中XX最好不要是动作性动词，而最好采用系动词来表示状态等等。
第四，so as to 容易出现动作发出者错误的问题，如 A is so X that B XX；而若A is so X as to XX就错了。
第五，so as to 容易受到宾语的参杂(从而混淆发出者)而出现问题。例如 OG 39.
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发表于 2012-8-19 18:04:45
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