There are many famous cultural relics in our country, many _______ thousands of years ago.
| A．dating back to | B．date back to | C．dated back to | D．were dated back to |
229. Look! The shop isn’t open yet. We _____.
| A．needn’t hurry | B．don’t need to hurry |
| C．must have hurried | D．needn’t have hurried |
228. Oh, the classroom is so dirty. It needs ______ before we begin our class.
| A．cleaned | B．being cleaned | C．to clean | D．Cleaning |
227. It is necessary that the question _______ at once.
| A．should settle | B．be settled | C．might be settled | D．would be settled |
226. Einstein lived the rest of his life quietly in America and _____ American nationality in 1940.
| A．bought | B．took part in | C．joined | D．Took |
225. I didn’t hear the phone last night. I _____asleep.
| A．must be | B．must have been | C．should be | D．should have been |