题目内容
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，30)
| A．couldn’t | B．mustn’t |
| C．shouldn’t | D．needn’t |
解析
—There's someone knocking on the door．Who it be?
—It must be Mary．She promised to be here at 8：00．
| A．must | B．can | C．shall | D．need |
It was playing video games that took the boy too much time that he have spent learning．
| A．could | B．must | C．might | D．ought to |
Don't use water to put out the fire if oil catches fire. As is known, oil ________ float on water.
| A．shall | B．must |
| C．may | D．will |
Sorry，Cathy，I didn’t know that you were badly short of money then.But you ________ me for help.
| A．must have asked |
| B．could have asked |
| C．would have asked |
| D．may have asked |
—Why，I didn’t get you on the phone.
—We ________football on the playground when you phoned.
| A．must be playing |
| B．must play |
| C．must have played |
| D．must have been playing |
These days some young people just ________ work hard because they have got used to the easy life provided by their parents.
| A．mustn’t | B．won’t |
| C．mightn’t | D．shouldn’t |
It ________be the vocabulary that caused you the problem in the exercise because you know a lot of words. (2013·安徽，34)
| A．may | B．couldn’t |
| C．should | D．needn’t |
—Mum, I'm tired.
—Well, if you ________ go to bed after midnight every night, what do you expect?
| A．will | B．may |
| C．should | D．can |