2、They have done things they ought ___ A. not to do B. not to be done C. not to have done D. not having done 3、I' m sorry I couldn't get in touch with him before he left, I ___ him earlier. A. had a telephone B. have phoned C. should have...
过去完成时(had done) 表示在过去的某个时间或动作以前已经发生的动作或已经存在的状态。就是我们常说的"过去的过去"。 Until then, his family hadn t heard from him for six months. 到那时为止,他家里已经有六个月没得到他的消息了。 07 过去将来时(would do) ...
例:The old clock had been being taken apart of and fixed up again for several times by my 10-year old son before I came back home. 我回到家之前,我10岁大的儿子已经把这个旧钟...
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