Stephen Hawking believes that the earth is unlikely to be the only planet______ life has developed gradually.
| A．that | B．where | C．which | D．whose |
The traffic accident wouldn’t have happened yesterday, but the driver _______ really careless.
| A．was | B．is |
| C．were | D．had been |
I had expected to come over to see you last night, but someone ______ and I couldn’t get away.
| A．called | B．had called |
| C．would call | D．would have called |
We had wanted to come to see him, but we ____ no time.
| A．had | B．had had |
| C．would have | D．would have had |
We had hoped that you would be able to visit us, but you _____.
| A．didn’t | B．hadn’t |
| C．needn’t | D．would not have |
We had hoped to catch the 10：20 train, but _____ it was gone.
| A．found | B．had found |
| C．would find | D．would have found |