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【題目】________ the air clean, the government will close some factories in the city.

A.KeepB.KeepingC.To keepD.Kept

【答案】C

【解析】

考查非謂語動詞。句意：為了保持空氣清潔，政府會關閉市里的一些工廠。結合句意和句子結構可知，此處應用不定式to do表目的，故選C項。

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