prep08一题求解

xiyuzisu

4.  Providing initial evidence that airports 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 the O'hare International airport is twice as much as that which is being emitted annually by all motor vehicles in the Chicago Metro area
A) as much as that which is being emitted annually by all
B) as much annually as is emitted by the
C) as much compared to what is annually emitted by all
D) that emitted annually by all
E) that emitted annually compared to
我不是很明白，这里的平行结构的tag是什么？twice吗？还是twice as much as？

ai559031

the total amount of pollutant emitted annually by vehicles at the O'hare International airport is twice that（total amount of pollutant) emitted annually by all....

Fiona09

对，看到 twice 就应该知道是考平行结构了，twice后面可以直接接名词，也可以加as much as