◎ 题干
— What are the _______ doing there?
— They are busy _______ their science experiment.
A.Boys students; to doB.Boy students; to do
C.Boys students; doingD.Boy students; doing
◎ 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“— What are the _______ doing there?— They are busy _______ their science experiment.A.Boys students; to doB.Boy students; to do C.Boys students; doingD.Boy …”主要考查了你对  【专有名词】【名词所有格】【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。