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theoldmaninthisfactorywhenhewasyoung?[]A.Did,usedtoworkB.Does.UsedtoworkingC.Did,usetoworkD.Do,usedtowork

题目详情
   the old man    in this factory when he was young ?  
[     ]
A. Did, used to work  
B. Does. Used to working      
C. Did, use to work   
D. Do, used to work
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答案和解析
C