◎ 题干
Before I began this job, I _____ a baby sitter for two years.
[     ]
A. have been    
B. was             
C. would be          
D. had been
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Before I began this job, I _____ a baby sitter for two years. [ ]A. have been B. wasC. would beD. had been…”主要考查了你对  【过去完成时】  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。