Mr. Green is said________an experiment to prove their new method of solving the problem when young.
| A．to do |
| B．to have done |
| C．to be doing |
| D．to have been doing |
The house still needed a lot of work, but __________ the kitchen was finished.
| A．instead |
| B．altogether |
| C．at once |
| D．at least |
-If only I __________ the key with me ！
-Then you would not have to wait for your wife's rescue.
| A．had had |
| B．have had |
| C．had |
| D．have |
-Mary didn't turn up last time, did she?
-No. She __________. We had changed our plan.
| A．didn't need to come |
| B．needn't have come |
| C．shouldn't have come |
| D．needn't have to come |
-Does your uncle still smoke?
-He __________ given it up. It's two years ever since he __________.
| A．can't have; smoked |
| B．may have; smoked |
| C．should have; has smoked |
| D．should have; didn't smoke |
My pain __________ obvious the moment I walked into the room, for the first man I met asked sympathetically，"Are you feeling all right?"
| A．must be |
| B．must have been |
| C．might have been |
| D．may be |