We have done much to protect the environment. So the river is getting than before. A. dirtier B. dirty C. cleaner D. clean 题目和参考答案——青夏教育精英家教网——

题目内容

9. (2015 •陕西) We have done much to protect the environment. So the river is getting than before.

A. dirtier B. dirty C. cleaner D. clean

9. C

9. C ‘析：由than before可知要用比较级,先排除B和D;结合本题中的“为了保护环境，我们做了很多事情”，由此可推断，河流变得比以前“更干净”了，故cleaner.符合题意

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