—You look tired.
—Yes. I non-stop until twelve o’clock.
A. hasn’t been working
B. wasn’t working
C. was working
D. didn’t work
网友回答
A. hasn’t been working
(答案→)B. wasn’t working
C. was working
D. didn’t work
解析：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。