----Another cup of tea? That’s your third since lunch.    ----Yeah, well, I ____ all night preparing for my history exam. I can hardly keep my eyes open.
#100513
A
have stayed up
B
stayed up
C
have been staying up
D
will stay up
推荐题目
---How can you keep slim as a mother of two sons?---I _______ in the gym for years.
#102426
A
have worked out
B
have been working out
C
have worked on
D
have been working on
Do you still remember the key points that ___________ in his report? I don’t remember them all. 
#102323
A
referred to
B
were referred
C
he was referred to
D
were referred to