She would love to have gone to the party, but she _______ extra hours to prepare for a meeting.
| A．had to work | B．had worked |
| C．could work | D．would have worked |
Your mother, however, ____ say that to us that day.
| A．does | B．did | C．is doing | D．was doing |
An awful accident, however, _____occur the other day.
| A．does | B．did | C．has to | D．had to |
What do you imagine _____ him from going?
| A．to prevent | B．preventing | C．to have prevented | D．prevented |
Who do you guess _____ to the station to meet her?
| A．to go | B．going | C．to have gone | D．went |
What do you suppose _____ him think so?
| A．to make | B．making | C．to have made | D．made |