After the mew technique was introduced ,the factory produced in 2001 as the year before.
| A．as twice many machines | B．twice many as machines |
| C．as many machines twice | D．twice as many machines |
—What do you think we can do for our aged parents?
—You________do anything except to be with them and be yourself.
| A．don't have to | B．oughtn't to |
| C．mustn't | D．can't |
Parents________send their children to school when they reach six years old.
| A．could | B．were able to |
| C．ought to | D．would |
—I don't care what people think.
—Well, you________.
| A．could | B．would | C．should | D．might |
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 |