【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(yǔ)動(dòng)詞。句意：為了保持空氣清潔，政府會(huì)關(guān)閉市里的一些工廠。結(jié)合句意和句子結(jié)構(gòu)可知，此處應(yīng)用不定式to do表目的，故選C項(xiàng)。

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