The policeman's attention was suddenly caught by a small box which ______ placed under the Minister's car.
| A．has been | B．was being | C．had been | D．would be |
The two girls are so alike that strangers find ____ difficult to tell one from the other.
| A．it | B．them | C．her | D．that |
It ___ be the postman at the door. It’s only six o’clock.
| A．mustn’t | B．can’t | C．won’t | D．needn’t |
She has already tried her best. Please don’t be too ____ about her job.
| A．special | B．responsible | C．unusual | D．particular |
In the last few years thousands of films ____ all over the world.
| A．have produced | B．have been produced |
| C．are producing | D．are being produced |
Last month, the Japanese government expressed their thanks for the aid they ___ from China.
| A．receive | B．are receiving | C．have received | D．had received |