og 12 37 so...as to 和 so that og12似乎已经说so。。as to的说法是错误的了

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
Idiom
Th is sentence correctly uses the idiomatic
construction so x that y where y is a subordinate
clause that explains or describes x: So debilitating
that it has become. … It clearly refers to
schistosomiasis, which is correctly modifi ed by
the adjective debilitating.

A Correct. In this sentence, the pronoun
reference is clear, and the so x that y
construction is concise.
B Th e noun debilitation creates an awkward,
wordy alternative and a slight change in
meaning; the subordinate clause is not
introduced by that; economical does not have
the same meaning as economic.
C Th e construction so x as to y is not a correct
idiom.
D Th e construction introduced by such is
awkward and wordy; debilitation is also
awkward and slightly diff erent in meaning;
that is omitted; economical does not have the
same meaning as economic.
E Th e noun debilitation creates an awkward,
wordy alternative and a slight change in
meaning; economical does not have the same
meaning as economic.
Th e correct answer is A.

这一题我不明白OG对C选项的解释，为什么so x as to y这种说法是错误的，我们经常用so 。。。as to阿 c选项为什么是错的

如果我们改成it is so debilitating that it has become ....是对的吗？

这个题目that后面引导的是结果状语从句还是主语从句？我没弄明白这个题目的逻辑关系

GMAC就是认为so...as to是错的，so as to应该连用

so...that...是可以的，是结果状语啊，如此。。。以至于。。。