Although one link in the chain was demonstrated to be weak, but not sufficiently so to require the recall of the automobile. (A) demonstrated to be weak, but not sufficiently so to require (B) demonstrated as weak, but it was not sufficiently so that it required (C) demonstrably weak, but not sufficiently so to require (D) demonstrably weak, it was not so weak as to require (E) demonstrably weak, it was not weak enough that it required Choices A and C entail ungrammatical constructions because they do not produce a sentence that has a main clause with a subject and a verb. In choice B, demonstrated as weak is unidiomatic; also in choices B and C Although and but should not be used together because only one is needed to express the relationship between the ideas. Choice D is best. Choice E is less concise and idiomatic than D; moreover, it is imprecise to say that one link in the chain (the referent of it) actually required the recall. The question is of middle difficulty. 答案：D。 记得以前无数NN们曾讨论过 so+adj+as to 的用法，其中的一个关键点就是 as to 后面的逻辑主语要等于句子主语，否则会引起歧义。但是看了上面og的解释，就有点糊涂了。虽然它解释的是E的错误，但是D里面的as to require的逻辑主语也是 it (one link in the chain), 就是说D和E在逗号后面部分的逻辑含义是相同的，都是it (one link in the chain) require，只不过E的使用不简洁而已。现在，og说E的逻辑搭配不对，那是不是D的逻辑搭配也不对呢？如果D的逻辑搭配合理，那就是说D里面的it指代的不是 one link in the chain，那it又指什么呢？
(D)(E)的句意不同
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(D)(E)的句意不同
懂了！如梦初醒！谢谢NN！
不错不错！解决我的一大难题：）
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