◎ 题干

The children are having a good time, ______ with sand, others with toys.
A.some of them playingB.some of them are playing
C.some of themD.who playing
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The children are having a good time, ______ with sand, others with toys.A.some of them playingB.some of them are playingC.some of themD.who playing…”主要考查了你对  【独立主格结构】  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。