—You were brave enough to argue with Mr. Smith.
—Well, now I regret _______ that.
| A．to do | B．to be doing |
C．to have done | D．having done |
23. It is too expensive for me to buy the car. I can’t_________it.
| A．pay | B．afford | C．sell | D．Spend |
22. Victor apologized for________to inform me of the change in the plan.
his being not able B. him not to be able
C. his not being able D. him to be not able
21. He decided not to attend her birthday party________he had been invited to.
| A．as if | B．even though | C．because of | D．Since |
20. _______, English is one of the most important subjects.
| A．It is known to all that | B．As is known to all that |
| C．As we know | D．As it is known to all |
19. At that time, people_____early in the morning in winter, and coal them warm.
| A．used to get up; used to keep | B．were used to getting up; was used to keep |
| C．used to get up; was used to keeping | D．were used to get up; was used to keep |