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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

(C)so debilitating is it as to become an economic     答案A

请问这里为什么不能选C中的so as to  

C：1，"is it"   wordy

      2 , "so...as to"  awkward

      2的原因在于使用as to do 结构不能表现出 that it has become 的意思，曲解了原意。

同意楼上的说法。其实英文字典里面的 so...as to=so...that

但是强调重点是不一样的。题目中的A，强调的是后半句，就是become an economic。。。

而C强调的是debilitating