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 O’Hare International Airport is twice as much as that which is being emitted annually by allmotor vehicles in the Chicago metropolitan area.
A.as much as that which is being emitted annually by all
B.as much annually as is emitted by the答案解释说annually应该放在emitted之后,这点我同意,但是我觉得is不应该出现
C.as much compared to what is annually emitted by all