—Waiter, what about my coffee? I______ for over 10 minutes.
—Sorry, sir. It will just be a moment
| A．am waiting | B．was waiting | C．had waited | D．have been waiting |
－Mary didn’t turn up last time, did she?
－No. She ______ . We had changed our plan.
| A．shouldn’t have come | B．needn’t have to come |
| C．didn’t need to come | D．needn’t have come |
They must have finished the work by the end of last month, ______?
| A．mustn’t they | B．haven’t they | C．hadn’t they | D．didn’t they |
－I didn’t know you were good friends.
－You ______. I have known her since she moved here. You were studying abroad then.
| A．may have | B．needn’t have | C．couldn’t have | D．must have |
.－Is there any flight to Tokyo today?
－I think there ______, for the weather is too bad.
| A．mustn’t | B．mightn’t be | C．needn’t be | D．can’t be |
Research findings show we spend about two hours dreaming every night, no matter what we ______ during the day.
| A．should have done | B．would have done |
| C．may have done | D．must have done |