◎ 题干
While I was in the Disneyland, I saw some children _____ in  the  roller coaster, laughing  happily.    
[     ]
A. sit
B. seat
C. to sit
D. sitting
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“While I was in the Disneyland, I saw some children_____ intheroller coaster, laughinghappily.[ ]A. sit B. seat C. to sit D. sitting…”主要考查了你对  【分词】  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。