◎ 题干
He works as an engineer now, but he________ on a farm for three years.
[     ]
A. has worked  
B. worked        
C. was working      
D. had 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“He works as an engineer now, but he________ on a farm for three years.[ ]A. has worked B. workedC. was workingD. had worked…”主要考查了你对  【一般过去时】  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。