◎ 题干
If a computer crashes, you will lose the file you ______ on if you don't save it early enough.  
[     ]
A. work          
B. are working        
C. will work          
D. worked
◎ 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“If a computer crashes, you will lose the file you ______ on if you don't save it early enough. [ ]A. work B. are working C. will work D. worked …”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。