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Often visible as smog, ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
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A 句子结构：“from”之后出现了主谓结构“hydrocarbons and nitrogen oxides……react with sunlight”，但“from”不是分句连接词，不能引导主谓结构。当前版本由 01**** 更新于2015-11-22 12:20:52 感谢由 01**** 对此题目的解答所做出的贡献。
C “when hydrocarbons and nitrogen oxides……react with sunlight”是由“when”引导的从句，而“ozone is formed……”是主句，两者语法功能不一致，结构不平行；
D “ozone”本应是主句的主语，缺少谓语动词，因此主谓结构不完整。
E 同D选项
主语ozone，谓语is formed， hydrocarbons and nitrogen oxides平行，two major pollutans同位语，react动词且符合谓语特征，因此原文句子结构有问题。B选型加when成为从句，react作为从句谓语，结构正确。C and when找不到平行对象，排除。D E主句主干变成了ozone react with..结构改变之后，就改变了原文语义，而且相差过大，排除。
昵称第28次
恍然大悟
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2019-08-27 15:02:20
炒肝烧鹅黄鳝粥水煎包
when hydrocarbons and nitrogen oxides, emitted by automobiles, react with sunlight.
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2019-07-06 05:55:05
ziyuanguo
a中from后接的是两个名词啊 comma后的句子只是同位语啊……
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2019-01-24 14:53:44
考GMAT的大树
A 有两个谓语is和react，之间需要连词 B 用when引导从句，完美 C and前后不平行 D 主句缺谓语 E react主谓不一致，应该是reacts
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2018-12-19 16:24:45
默默
and when 多余，Ａ一个句子两个动词
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2018-04-26 00:34:53
默默回复默默
D没谓语
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2018-04-26 00:35:15
默默回复默默
Ｅ主谓不一致
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2018-04-26 00:38:57
夕阳下的春日部
考点：句子结构 “hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight”是完整的句子，应该由引导dependent clause的连词when引导，故排除A,E 又因为是一个dependent clause，所以不能用and隔开，排除C D选项没有谓语动词
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2015-11-12 10:34:27
四叶草之丘
这道题的中的“two major pollutants emitted by automobiles”可以省略不看，因为react with sunlight中的react是复数形式，所以，它应该是和前面的hydrocarbons and nitrogen oxides搭配。那么后面搭配的是一个完整的句子。所以这里不能在使用 be formed from这个短语，排除A E。那么根据题意，这里when应当引导一个时间状语从句，选B
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2015-06-26 17:52:51
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句子改错SC
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