The hotel is going to employ an assistant with ______ knowledge of French and ______ experience of management.
| A．不填； an | B．the；the | C． a； an | D．a；不填 |
The old man has retired from the factory. He _____ there for 30 years.
| A．works | B．worked |
| C．has worked | D．was working |
— I don’t mind telling you what I know.
— You _______. I can manage it myself.
| A．mustn’t | B．ought not to |
| C．can’t | D．don’t have to |
—Have you heard of the accident on this road last night?
—Yes. And there ________ three accidents here so far this year.
| A．are | B．were |
| C．have been | D．had been |
The students _______are hard-working and ready to help should be praised.
| A．who | B．whom | C．which | D．whose |
— What’s the noise outside?
— Some children ________ hide-and-seek in the yard.
| A．were playing | B．are playing |
| C．have played | D．played |