【题目】________ the air clean, the government will close some factories in the city.
A.KeepB.KeepingC.To keepD.Kept
在线课程【答案】C
【解析】
考查非谓语动词。句意：为了保持空气清洁，政府会关闭市里的一些工厂。结合句意和句子结构可知，此处应用不定式to do表目的，故选C项。
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