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—You look tired.  
—Yes. I _____ non-stop until twelve o’clock.   
A.hasn’t been workingB.wasn’t workingC.was workingD.didn’t work
B
本题考查时态。Until twelve o’clock 说明工作已经完成,应用过去时态;同时说明在12点以前动作持续进行,故应用进行时态。答案为B。
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