RT 比如一个句子中it出现2次，2个it一个是形式主语，一个是代词，指代前面的某个东西，2个代词指代不一样，是不是这个句子就是错的？ 比如这个题目。 Ozone, a special form of oxygen that screens out harmful ultraviolet rays, reaches high concentrations twelve miles above Earth, where it has long appeared that it was immune from human influence; we have now realized, though, that emissions of industrial chlorofluorocarbons deplete the ozone layer.
(A) has long appeared that it was immune from (B) has long appeared to have been immune from (C) has long appeared as being immune to (D) had long appeared immune to (E) had long appeared that it was immune to
The word, it, refers to two different concepts, indeed. Moreover, the past tense isn't appropriate, either, even if everything else is OK. Finally, the structure is awkward.
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发表于 2010-3-1 17:47:43
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