—Another cup of coffee? That’s your third since lunch.
—Yeah, well, I all night preparing for my history exam. I can hardly keep my eyes open.
A. stayed up
B. have stayed up
C. have been staying up
D. will stay up
网友回答
(答案→)A. stayed up
B. have stayed up
C. have been staying up
D. will stay up
解析：可联系答.案.网客服索取。