84. Often visible as smog, ozone is formed in the atmospherefrom hydrocarbons and nitrogen oxides, two major pollutants emitted byautomobiles, 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, andwhen
(D) ozone, formed in the atmosphere when
(E) ozone, formed in the atmosphere from
关于C选项,OG解释And when distorts the meaning,suggesting that ozone is formed in two ways.
一开始我没理解OG这么解释的意思,后来查了论坛,明白了OG这么解释的意思实际上是把C选项中的and后面的部分看成了省略,补充完整就是:
Often visible as smog, ozone is formed in the atmosphere,and (it is formed)when hydrocarbonsand nitrogen oxides, two major pollutants emitted by automobiles, react withsunlight.
那么我的疑问就是在这里and后面省略的部分是主谓结构it is formed,这么省略是切当的么?有没有什么rule呢? |