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It was three o'clock he came back from work. [ ]A. since B. that C. before D. wh

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It was three o'clock he came back from work. [ ]A. since B. that C. before D. wh

It was three o'clock _______ he came back from work.[     ]A. since       
B. that       
C. before        
D. when

试题答案

D