— They are said to have been familiar with each other.
— But they_________. They were introduced only hours ago.
| A．may not have been | B．couldn’t have been |
| C．mustn’t have been | D．needn’t have been |
相关试题
An awful accident_____，however，occur the other day.
| A．does | B．did | C．has to | D．had to |
Greenland， _____ island in the world，covers over two million square kilometers.
| A．it is the largest | B．that is the largest | C．is the largest | D．the largest |
_____， he often forgot to turn off the lights.
| A．Even better | B．Strange | C．However | D．Fortunately |
I
t was not until she had arrived home_______ her appointment with the doctor
| A．did she remember | B．that she remembered |
| C．when she remembered | D．had she remembered |
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