◎ 题干
—I have got a headache. 
—No wonder. You ________ in front of that computer too long.
[     ]
A. work    
B. are working    
C. worked    
D. have been working
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“—I have got a headache.—No wonder. You ________ in front of that computer too long.[ ]A. work B. are working C. workedD. have been working…”主要考查了你对  【现在完成进行时】  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。