It worries our government a lot that the air in our city is than it used to be.A. very go

问题补充：

It worries our government a lot that the air in our city is than it used to be.

A. very good

B. much better

C. rather bad

D. even worse

答案：

A. very good

B. much better

C. rather bad

(答案→)D. even worse

解析：句意：它很担心我们的政府对于我们城市的空气会更遭比我们过去的空气。分析比较级的形式than因此用比较，只有第二项与第四项符合，但是前面提到的是担心，因此现在的空气比以前更不好，故选 D