◎ 题干
— What are they doing?
— They _________ a song.
[     ]
A. are listening
B. sing
C. are staging
D. is singing
◎ 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 they doing?— They _________ a song. [ ]A. are listening B. singC. are staging D. is singing …”主要考查了你对  【实义动词】【现在进行时】【主谓一致】  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。