◎ 题干
一What do you usually do when you see others ________?
一I usually stop them and ________.

[     ]

A. litter; pick it up
B. littering; pick up it
C. litter; pick it
D. littering; pick it up
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“一What do you usually do when you see others ________? 一I usually stop them and ________. [ ]A. litter; pick it up B. littering; pick up it C. litter; p…”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。