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.
语法 Sentence Correction-3596
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正确的用户笔记
jhb999 2015-10-15 15:18:17
it has long appeard that中it是形式主语，后面的it是指Ozone，两个it指代对象不一致
如果纯白可以开出蔷薇 2015-03-19 22:02:21
从句不简洁
cocowu 2014-07-27 23:06:59
where "it " 主語/ that "it "is ozone
许栩 2016-11-12 15:51:35
it has long appear that... 固定句式：it 是形式主语，而后面的it则指代ozone，前后不一致
honeydew 2016-09-28 16:30:54
文中出现两个IT ,前一个是形式主语，后一个指代真正的主语OZONE。
IAMBACK 2016-06-17 17:29:22
(A) it has long appeard that中it是形式主语，后面的it是指Ozone，两个it指代对象不一致。
katritina 2016-05-07 09:58:20
it has long appeard that中it是形式主语，后面的it是指Ozone，两个it指代对象不一致。
ypheroin 2016-01-29 20:12:17
同一句出现两个it指代不同。
ypheroin 2016-01-13 15:20:18
未划线部分的where it 中it是形式主语，that it 中it 指代ozone，同一个代词在一个句子里出现两次却指代不同的东西，不对
HYX 2015-11-19 14:01:46
it has long appeared的it 是指示代词，而后面的it was 的it是 ozone两者意思不同，不能同时都用it 来代替； immune to 是不受影响； immune from 是免除的意思
yiyiibic85 2015-09-05 04:55:58
it has long appeard that中it是形式主语，后面的it是指Ozone，两个it指代对象不一致。
moneysharon 2015-08-10 08:23:20
[我]前後時態不一?[正]同一句子中同一代词只能指代相同东西 划线前有it是形式主语，划线后it指代不同
