Now the air in Yancheng is than it used to be . We should do something to stop it .A. ver

问题补充：

Now the air in Yancheng is than it used to be . We should do something to stop it .

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：现在羊城的空气比过去甚至更糟糕。我们应该做一些事情去阻止它。根据than可知用的是比较级，故选择D。