—The windows are dirty.
—I know. They _________ for weeks.
| A．haven’t cleaned | B．didn’t clean |
| C．weren’t cleaned | D．haven’t been cleaned |
270. The main task of the government is to reduce the level of inflation (通货膨胀). The word "task" means ______.
| A．exercise | B．job | C．habit | D．Favourite |
269. Records, ____, walkman CD and MD are the same instruments that we can use to enjoy music.
| A．tapes | B．hammers | C．diamonds | D．Telegram |
268. The limited supply of water has been put into practice, take care to turn off the running ____ before you leave.
| A．radio | B．traffic lights | C．gas | D．Tap |
267. When he was very young, he made up his mind to be a doctor. Which of the following words can not be used instead of the underlined word?
| A．tailor | B．translator | C．Tibetan | D．Tourist |
266. Mr. Green's are at table now. The underlined part means ____.
| A．beside the table | B．having dinner | C．at the table | D．making a table |