求解Prep08的1个句子，选项为什么是错的

holdurfire · 发表于 2013-10-14 00:17:27

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 all motor vehicles in the Chicago metropolitan area.
B.as much annually as is emitted by the D. that emitted annually by all
题目就是这样，答案是D。B错误的解释是annually位置不对，但是没看明白的是is，如果排除annually，那么句子是这样，the amount of pollutant emitted by A is twice as much as the amount is emitted by B，is是哪来的呢？是the amount of pollutant that is emitted by A as that is emitted by B吗？如何省略的？语法不明白，求解语法点

求解Prep08的1个句子，选项为什么是错的

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