◎ 题干
I have been working with Lily for years, and never before        her so serious!
[     ]
A. I found        
B. I have found   
C. did I find      
D. have I found
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I have been working with Lily for years, and never beforeher so serious![ ]A. I found B. I have foundC. did I find D. have I found…”主要考查了你对  【一般过去时】【部分倒装】  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。