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Before I began this job, I a baby sitter for two years. [ ]A. have been B. was C

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Before I began this job, I a baby sitter for two years. [ ]A. have been B. was C

Before I began this job, I _____ a baby sitter for two years. [     ]A. have been    
B. was             
C. would be          
D. had been

试题答案

D