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【题目】We have done much to protect the environment. So the river is getting than before.

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

【答案】C

【解析】

试题分析:句意:我们已经做了许多去保护环境。所以河流现在比以前变得更干净了。A. dirtier更脏,形容词的比较级; B. dirty脏的,原级; C. cleaner更干净,比较级; D. clean 干净的,原级。than比,用于两者比较,所以用比较级,根据上句已经做了许多保护环境的事情,可知河流更干净,故选C。

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