这题是OG12 的37题,根据og解释so x as to y是不符合习惯用法的: 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 ? 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 modi? 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 ? 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 ? e construction so x as to y is not a correct idiom. D ? e construction introduced by such is awkward and wordy; debilitation is also awkward and slightly di? erent in meaning; that is omitted; economical does not have the same meaning as economic. E ? e noun debilitation creates an awkward, wordy alternative and a slight change in meaning; economical does not have the same meaning as economic. ? e correct answer is A. 接下来请看新prep174的题目: Often major economic shifts are (so gradual as to be indistinguishable) at first from ordinary fluctuations in the financial markets. A. so gradual as to be indistinguishable B. so gradual so that they can be indistinguishable C. so gradual that they are unable to be distinguished D. gradual enough not to be distinguishable E. gradual enough so that one cannot distinguish them 答案选A,此处认为C比A复杂了,我没有异议。但是对于og那题,我选了C,实在不知道为什么错。难道是因为倒装么?但是官方解释里面并没有提到这个问题。斑竹NN们出现一下吧~谢了