题干
—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.
—Yeah, well, I ____ all night preparing for my history exam. I can hardly keep my eyes open.
A：stayed u
B：have stayed u
C：have been staying u
D：will stay u
答案(点此获取答案解析）
A
