—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 |
China is developing fast. That's ________ I think those of my colleagues who deal with China affairs should visit China.
| A．because | B．why |
| C．when | D．how |
The old woman is warmhearted. She is always ready to help ________ is in trouble.
| A．no matter who | B．whomever |
| C．whoever | D．anyone |
After a day's exhausting climb we arrived at ________ we had been told was “Garden in the Air”．
| A．what | B．which |
| C．that | D．where |
Her son was accused of cheating by the police, ________ made it difficult for her to go to sleep.
| A．what | B．as |
| C．which | D．where |
The Olympics are like a huge stage ________ everyone makes every effort to achieve their dreams.
| A．that | B．when |
| C．which | D．where |