—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
本題考查時(shí)態(tài)。Until twelve o’clock 說明工作已經(jīng)完成，應(yīng)用過去時(shí)態(tài)；同時(shí)說明在12點(diǎn)以前動作持續(xù)進(jìn)行，故應(yīng)用進(jìn)行時(shí)態(tài)。答案為B。
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