◎ 题干
On Saturdays, students are very proud to be         on the street to guide passers-by to obey traffic rules.
A.charactersB.volunteersC.operatorsD.graduates
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“On Saturdays, students are very proud to be on the street to guide passers-by to obey traffic rules.A.charactersB.volunteersC.operatorsD.graduates…”主要考查了你对  【可数名词及其单复数】【集合名词】【名词】  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。