——You didn’t wait for Mr. Black last night, did you?
——No, but we ____. He didn’t return home at all.
| A．couldn’t have | B．needn’t have |
| C．didn’ t need to | D．should wait have |
It doesn’t matter to me _____I miss my train, because there’s another one later.
| A．that | B．if | C．unless | D．when |
___we admit that there are still some problems about NMET, we don't mean that it is of no use.
| A．Until | B．While | C．As | D．Unless |
—I thought you wouldn’t mind.
—Well, as a matter of fact I _____; but you should have asked me first.
| A．did | B．do | C．won’t | D．don’t |
The newcomer is from Tibet, ________ I can tell from his appearance.
| A．which | B．what | C．where | D．who |
The time is not far away______modern communications will become widespread in China’s vast countryside.
| A．as | B．until | C．before | D．when |