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The government has to close those small factories to prevent the water of the river ______.

A．polluting B．from polluting 
C．being polluted D．polluted 

C

解析試題分析：考查短語(yǔ)固定搭配。本題考查短語(yǔ)固定搭配prevent … from doing sth阻止做某事。句意：政府不得不關(guān)閉這些小工廠來(lái)阻止河水受污染。故C正確。
考點(diǎn)：考查短語(yǔ)固定搭配

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