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。