She is a wellknown doctor now, but she ________ as a cleaner at the hospital for five years.
| A．has worked | B．worked |
| C．had worked | D．works |
The traveler couldn’t make himself _____ in his poor English.
| A．understand | B．understanding | C．to understand | D．understood |
He rushed out of the burning house with the little boy in his arms ____________ the roof fell down and the boy was saved.
| A．after | B．as | C．before | D．until |
A new supermarket ______ here. They hope to finish it next month.
| A．will build | B．is built | C．has been built | D．is being built |
--- I’ll tell Mary about her new job tomorrow.
--- What? You ______ her last week.
| A．ought to tell | B．must have told | C．might have told | D．should have told |
--- I don’t mind telling you what I know.
--- You _________ . I am not asking you for it.
| A．mustn’t | B．can’t | C．needn’t | D．should not |