◎ 题干
Professor Smith, along with his students,_____ on the work day and night  
[     ]
A. work    
B. working    
C. is working    
D. are working
◎ 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“Professor Smith, along with his students,_____ on the work day and night[ ]A. workB. workingC. is workingD. are working…”主要考查了你对  【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。