— You look tired.— Yes. I non-stop until 8 o’clock.A. had workedB. workC. have workedD. w

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(答案→)A. had worked
B. work
C. have worked
D. was working
解析：考察时态。句意：你看起来很累。——是的，我昨晚知道八点才睡觉。可知下文描述的是在过去某个时间点已完成的动作，故用过去完成时态，选A。