________ he driven more carefully, the accident would not have happened the other day.
| A．Be | B．Had | C．Has | D．Would have |
I ________ use a clock to wake me up because at six o'clock each morning the train comes by my house.(2012·新课标全国)
| A．couldn't | B．mustn't | C．shouldn't | D．needn't |
We________finish it ahead of time, though it was such a tough task.
| A．could | B．would |
| C．were able to | D．ought to |
She was very brave.Even though she'd hurt her leg, she________go back alone.
| A．could | B．might |
| C．have to | D．was able to |
The fire spread through the hotel very quickly but everyone________get out.(全国)
| A．had to | B．would |
| C．was able to | D．could |
I'm going to Europe on vacation together with John if I ________ find the money.(2012·全国Ⅱ)
| A．can | B．might | C．would | D．need |