— You look tired.
— Yes. I non-stop until 8 o’clock this morning.
A. had worked
B. work
C. have worked
D. was working
网友回答
(答案→)A. had worked
B. work
C. have worked
D. was working
解析：考查时态.句意:你看起来很累.——是的。我一直不停的工作到今天早上八点钟。可知句子描述的是过去发生已经完成的动作，故用过去完成时态。选A。