When ________ questions in class, one should answer them as clearly as possible.
| A．asking | B．to ask | C．to be asked | D．asked |
His letter was especially welcome as I ____ from him for long.
| A．haven’t heard | B．would not heard | C．hadn’t heard | D．didn’t heard |
—May I speak to your manager Mr.Williams at five o’clock tonight?
—I’m sorry. Mr. Williams ________ to a conference long before then.
| A．will have gone | B．had gone | C．would have gone | D．has gone |
We_______onitforseveralhoursbutwehavenotyetreachedanyconclusion.
| A．work | B．areworking | C．havebeenworking | D．havebeenworked |
I ____ to go for a walk, but someone called and I couldn’t get away.
| A．was planning | B．planned | C．had planned | D．would plan |
Salley________Beijing for Shanghai and________there ever since. You can go and pay her a
visit on your way to Hangzhou.
| A．has left; worked | B．left; worked |
| C．has left; had worked | D．left; has worked |