They must have been enjoying themselves there, otherwise they _______ so long.
| A．can’t have stayed | B．wouldn’t have stayed |
| C．needn’t have stayed | D．couldn’t stay |
Look! the ground is wet. It must have rained last night, _______?
| A．hasn’t it | B．didn’t it | C．mustn’t it | D．hadn’t it |
Generally speaking, _______ according to the directions, the drug has no side effect.
| A．if taking | B．if taken | C．if to take | D．if being taken |
Tom is _______ learning English. To learn it well, he abandons all his hobbies.
| A．bound to | B．desperate to | C．bent on | D．accustomed to |
You are always telling me I am lazy. Look at your room. What a mess it is! ________.
| A．The day has eyes, the night has ears |
| B．The great thieves punish the little ones |
| C．That is like the pot calling the kettle black |
| D．When one will not, two cannot quarrel |
— It’s ten years since I met you last time. I ________ you at all.
—I wouldn’t have, either, if someone ________ you by name.
| A．didn’t recognize; didn’t call | B．haven’t recognized; didn’t call |
| C．can’t recognize; had called | D．didn’t recognize; hadn’t called |