比较的省略问题求教

wangwanwang

Providing initial evidence that airport are a larger source of pollution than they were once believed to be, environmentalists in Chicago report that the total amount of pollutant emitted annually by vehicles at O’Hare International Airport is twice as much as that which is being emitted annually by all motor vehicles in the Chicago metropolitan area.

• as much as that which is being emitted annually by all
  
• as much annually as is emitted by the
  
• as much compared to what is annually emitted by all
  
• that emitted annually by all
  
• that emitted annually compared to the
  

答案是D,我选得B,错在什么地方啊?

我是这样想的，比较的是pollutant，同一主语的主语比较？所以在B中

• as much annually as（pollant) is emitted by the...相当于省略了主语（
• 我记得同一主语比较是可以省略的)然后选了B然后又错，还有比较时候的省略问题
• 到底是怎么弄啊，我急了一堆笔记，各种说法的，可还是做一次错一次
• 屡试不爽。。
• 
  
  

wangwanwang

在论坛逛了又逛总算发现宝那位牛gd牛jm能总结比较级than后的省略规则？谢谢！
http://forum.chasedream.com/foru ... amp;fromuid=1032332
贝了，复制给大家看辣

wangwanwang

[原创]比较之庖丁解牛
http://forum.chasedream.com/foru ... amp;fromuid=1032332
逛了一下午，明白啦不少， 还有这个给大家看

Ahbu.

B的话  你默认比较的两个对象是同一个污染物  不仅是同一种  所以要用that指代