◎ 题干
Professor Smith, along with his assistants,          on the project day and night to meet the deadline
(截止日期).  
[     ]
A. work            
B. working        
C. is working        
D. were keeping
◎ 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 assistants,on the project day and night to meet the deadline(截止日期). [ ]A. workB. working C. is workingD. were keeping…”主要考查了你对  【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。