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
专门查了so as to,so...as to,so...that的用法,之前有个讨论帖,也明白了些,那我还有个问题,关于C选项,如果改成it is so debilitaing as to become an ecomomic,是不是就可以成为一个正确选项了呢?