All flights   because of the storm, they had to wait in the hall.
#94560
A
have put off
B
were put off
C
have been put off
D
having been put off
推荐题目
I'll have you ______ English in six months . 
#98544
A
speaking
B
speak
C
spoken
D
be able to speak
- Doing it like this means _______ time. -I didn’t mean ______ it.
#95810
A
wasting…to do
B
to waste…doing
C
waste…do
D
wasting…doing
_____ her mother had come, her face lit up.
#98295
A
Hearing
B
Having heard
C
When heard
D
When she heard
No matter how frequently _______, the works of Beethoven still attract people all overthe world.
#94629
A
performed
B
performing
C
to be performed
D
being performed