求助！！大神们。。。og SC88

mogu724

88. Often visible as smog, ozone is formed in the atmospherefrom hydrocarbons and nitrogenoxides, 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

Grammatical construction; Idiom

The preposition from is incorrect because ozone is formed from x and y react is not a grammatical structure.Replacingfrom with the subordinating conjunction when makes the sentence complete: Ozone is formed when x and y react. A main clause is followed by asubordinate clause.

A The preposition from introduces an incoherent andungrammatical construction.

B Correct. The conjunction when introduces a subordinate clause, whichcompletes the sentence correctly and coherently.

C And when distorts the meaning, suggesting that ozone isformed in two ways.

D Omitting the main verb, is, results in a sentence fragment.

E These changes result in a sentence fragment.

The correct answer is B.

ozone也可以自己form 啊 为什么要用被动？？？？？？

qiongle

DE句子fregament了啊

kiwifoodtown

LZ还是多读两遍句子，明白了意思你就不会这么问了。

mogu724

qiongle 发表于 2013-8-21 08:56
DE句子fregament了啊

求解答？？为什么不完整？？ formed 做谓语前面不能加逗号是么。。。我语法太差了。。

mygg_1314

如果非要是主动，五个选项都没有对的了。LZ多做些题体会一下主被动的感觉~~~

mogu724

mygg_1314 发表于 2013-8-22 00:17
如果非要是主动，五个选项都没有对的了。LZ多做些题体会一下主被动的感觉~~~ ...

能具体解释下D么。。。还是没得解释 只是做题感觉问题？？？求问

mygg_1314

mogu724 发表于 2013-8-22 09:42
能具体解释下D么。。。还是没得解释 只是做题感觉问题？？？求问

如果是D选项的话，整个句子就没有谓语动词了呀。

mogu724

mygg_1314 发表于 2013-8-22 16:41
如果是D选项的话，整个句子就没有谓语动词了呀。

formed不是么？？

mygg_1314

mogu724 发表于 2013-8-22 18:23
formed不是么？？

D中，从form到nitrogenoxides都是过去分词做后置定语，或者你可以理解成同位语，是修饰成分可忽略。

mygg_1314

mygg_1314 发表于 2013-8-22 16:41
如果是D选项的话，整个句子就没有谓语动词了呀。

说错了，不是到nitrogenoxides，是到句子结束都是后置定语