now the air in our city is-----than it used to be .something must be done to stop it.A very good

题目

now the air in our city is-----than it used to be .something must be done to stop it.A very good
B much better C even worse 还有it usde to be 后面那句也不明白

答案

选 C .
翻译为：现在我们城市的空气比以前更加糟糕了,应该采取一些措施来阻止它（恶化）了.