--- I remember you were a talented pianist at college. Can you play the piano for me?
--- Sorry, I _ the piano for years. (2012．湖南)
A don’t play
B. wasn’t playing
C. haven’t played
D. hadn’t played
---Tell us, Mark, what is the cause of the American Civil War?
---Well, is it _______the black slaves wanted freedom?
| A．how | B．why |
| C．because | D．when |
--- I can’t carry the luggage．It’s so heavy.
--- Why not have someone strong enough_______ you a hand then?
| A．give | B．to give |
| C．giving | D．to have given |
Although she brushed the old pot_______, she could not make it completely clean, which made her very upset.
| A．roughly | B．thoroughly |
| C．instantly | D．occasionally |
Mr．Smith is always on time for everything．How ____ it be that he was late for the important meeting?
| A．should | B．can | C．may | D．must |
---Your grandfather still seems very energetic, although he is already in his seventies now.
---Yes, he _______in the army for three years when he was young.
| A．would serve | B．served |
| C．had served | D．has served |