Thanks to the measures by the local government , the polluted river is becoming clearer a

Thanks to the measures by the local government , the polluted river is becoming clearer and clearer and fish have begun to show up in it.
A. taking
B. taken
C. to take
D. having taken

A. taking(答案→)B. takenC. to takeD. having taken解析：考查非谓语动词。句意：多亏了被当地政府才去的措施，被污染的河流变得越来越清澈，鱼开始在里面出面。根据语境是措施被当地政府采取，所以用过去分词taken，选B。

就是这个解释

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