It was the skills that he had acquired at his training period enabled him to get such a high post in that world-famous company.
| A．when | B．that | C．who | D．which |
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 |
224. The murderer was brought in, with his hands _____ behind his back.
| A．being mopped | B．having tied | C．to be tied | D．Tied |