◎ 题干
It's our duty to _____ people _____ too many tree.
[     ]
A. stop; cutting down    
B. prevent; to cut
C. keep; cutting down  
D. make; cut down
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“It's our duty to _____ people _____too many tree. [ ]A. stop; cutting downB. prevent; to cutC. keep; cutting down D. make; cut down…”主要考查了你对  【动名词】【动词短语】  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。