◎ 题干
单项选择。
— Where are the runners?    
— Over there. They ______ warming-up exercises.
[     ]
A. is doing   
B. do    
C. are doing    
D. does
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“单项选择。— Where are the runners? — Over there. They ______ warming-up exercises. [ ]A. is doing B. do C. are doing D. does …”主要考查了你对  【实义动词的现在分词】【现在进行时】  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。