______ for two days, Steve managed to finish his report on schedule.
| A．To work | B．Worked |
| C．To be working | D．Having worked |
A fire broke out last night, ____ three children and two adults.
| A．killed | B．killing | C．kill | D．to kill |
Not until the car looked almost new____ cleaning it.1网
| A．John stopped | B．did John stop | C．stopped John | D．John did stop |
Time ____ never comes again. So we’d better make full use of our time.
| A．losing | B．lost | C．being lost | D．having lost |
The order came that the enemies ____ in two hours.
| A．would be defeated | B．should defeat |
| C．should be defeated | D．must be defeated |
If it had not been for your help, I ____ the examination.
| A．could not pass | B．would not pass |
| C．would not have passed | D．can not have passed |