◎ 题干
Some policemen were sent there to ________ the villagers ________ the trees.
A.keep; cutting down B.prevent; cutting down
C.prevent; to cut up D.stop; to cut up
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Some policemen were sent there to ________ the villagers ________ the trees.A.keep; cutting downB.prevent; cutting downC.prevent; to cut upD.stop; to cut up…”主要考查了你对  【一般现在时】【一般现在时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。