68. Often visible as smog, ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.
(A) ozone is formed in the atmosphere from
(B) ozone is formed in the atmosphere when
(C) ozone is formed in the atmosphere, and when
(D) ozone, formed in the atmosphere when
(E) ozone, formed in the atmosphere from
这道题我做对了，就是对于OG对C的解释不太理解：
In choice A, the construction from hydrocarbons and nitrogen oxides ... react is ungrammatical. In B, the best choice, the conjunction when replaces the preposition/row, producing a grammatical and logical statement. In choice C, the use of the conjunction and results in the illogical assertion that the formation of ozone in the atmosphere happens in addition to, rather than as a result of, its formation when hydrocarbons and nitrogen oxide react with sunlight. Choice D omits the main verb, is, leaving a sentence fragment. E compounds the error of D with that of A.
麻烦大家帮我解释一下吧，谢谢！
In choice C, the use of the conjunction and results in the illogical assertion that the formation of ozone in the atmosphere happens in addition to, rather than as a result of, its formation when hydrocarbons and nitrogen oxide react with sunlight
我理解是：
在选择C中，对于“连词and”得使用，导致了一种不合逻辑得推断（断言）：【除了臭氧的合成发生于空气中以外】，还需要一种条件就是【hydrocarbons and nitrogen oxide react with sunlight】
而且这样的对于【hydrocarbons and nitrogen oxide react with sunlight】的是一种条件的理解远远大于【臭氧的合成】是【hydrocarbons and nitrogen oxide react with sunlight】一种结果的理解。
又是gonghao帮的忙啊，谢谢你呀！
我再体会体会...
那我可不可以这样理解：
B表明【臭氧的合成】就是【hydrocarbons and nitrogen oxide react with sunlight】
而C说【hydrocarbons and nitrogen oxide react with sunlight】只是【臭氧的合成】的条件之一
再问一个问题：
单纯从语法上看，有没有这种表达方式：A is formed in ..., and when...
（其中“in...”和“when...”是两个并列的状语）
(B)
ozone is formed in the atmosphere when hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.
当【hydrocarbons and nitrogen oxides react with sunlight.】的时候，臭氧就在空气中生成了－－－强调生成了
(C) ozone is formed in the atmosphere, and when hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.
臭氧【在空气中】生成，并且【是在hydrocarbons and nitrogen oxides react with sunlight.】的时候－－－强调了条件。
单纯从语法上看，有没有这种表达方式：A is formed in ..., and when...
（其中“in...”和“when...”是两个并列的状语）
－－－呵呵，你够狠，
感觉单纯从语法上来说，感觉是可以的
但是还是要看逻辑意思和动作先后的关系
决定是并列还是先后
因为像formed是“瞬间”动词，不具备when从句的。。。
要么，once大概是可以的
－－－呵呵，说实话真是从没想过这种问题
哈哈，麻烦你了呀...
那么再问一个问题，如果“A is formed in ..., and when...”的形式是可以的，
那么他和B选项的形式的区别在哪里？(B) ozone is formed in the atmosphere when...
A is formed in ..., and when...,
and前有逗号，所以and后需要一个完整的句子吧，而when引导的壮语不成句。
嗯！
就是的，in ... when...这种不同层面上的壮语直接依次放置就可以了，根本不需要用and
除非同一层面并列的才用and连接，比如when..., and when...
这回我的理解对了吗？
呵呵，实在不好意思，本来一个很初级的语法现象，好像被我绕来绕去就给绕进去了...
gonghao，我把自己弄晕了，是不是也把你给弄晕了呀？实在抱歉哦！！
carolhide说的应该是对的，谢谢carolhide！！也谢谢gonghao！！
好快呀，下午发的帖子，这会儿都被压到最下面了。
再顶顶
看看还有没有人再帮我确认一下
gonghao，我把自己弄晕了，是不是也把你给弄晕了呀？实在抱歉哦！！
恩我从面想过状语能并列
晕了
and是加句子得，同意
A is formed in ..., and when...
状语从句不能并列
我查了一下白用的书
主句一般是不合状语从句并列的
并列要形式上对等
继续讨论语法？：）
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