We are needed to find a way we can think of as soon as possible________the pollution.
| A．to prevent |
| B．preventing |
| C．prevented |
| D．prevent |
一Is there any possible way to help them get rid of such a bad habit?
一To tell the truth, it’s very hard．But we on this problem．
| A．worked | B．had worked | C．are working | D．had been working |
What I wanted to know was when and where the meeting______.
| A．was holding | B．had held | C．was to hold | D．was to be held |
It is said that the meeting ______ for three hours. Why should I regret missing it?!
| A．has lasted | B．has been lasting | C．lasted | D．had lasted |
—Isn’t it a great surprise that I happened to meet my university English teacher at the South Bank Parkland last week?
—How long ____ you _____ each other, then?
| A．hadn’t; seen | B．haven’t; seen | C．didn’t; see | D．don’t; see |
Mr. Wang _____ table tennis well, though he suffers from a waist pain and _____ it for a long time.
| A．played; has not played | B．plays; had not played |
| C．plays; did not play | D．plays; has not played |