----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
All possible means ____ to prevent the air pollution, but the sky is still not clear. 
#100326
A
is used
B
has been used
C
are use
D
have been used
The vase ____easily. Be careful when you handle it.
#102727
A
will be broken
B
will break
C
is broken
D
breaks
He _______ Alice for ten years.
#100485
A
married to    
B
has married to
C
has married   
D
has been married to