Ozone, a special form of oxygen that screens out harmful ultraviolet rays, reaches high concentrations twelve miles above Earth, where it had long appeared that it was immune to human influence; we have now realized, though, that emissions of industrial chlorofluorocarbons deplete the ozone layer.
语法 Sentence Correction-3600
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欧哦哦 2015-05-16 21:38:51
前后两个it指代不一致
lok19600618 2014-05-05 18:58:00
前面那个it居然是形式主语，后面那个it是指ozone，所以指代不一不可以。
moneysharon 2015-08-10 08:35:05
[我]that it was [正解]前面那个it居然是形式主语，后面那个it是指ozone，所以指代不一不可以。
vigari 2017-01-01 22:06:26
it指代不清
ypheroin 2016-01-13 15:25:30
where it had ... that it was， 两个it指代不同
ithoney 2015-10-08 23:47:29
划线外IT指代EARTH，线内IT指代ozone，同一句相同代词指代不一致
yiran32069 2015-09-16 15:27:06
it 指代不清
秦瑶 2015-09-10 17:46:15
immune to 不受...的影响 immune from 免除... that从句中的it指代 Ozone，而where后面的it 指代Earth, 所以it 指代不一致
Ines 2015-08-05 15:56:25
注意划线前后的内容。尤其代词。
