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大学英语六级考试词汇笔记 51. He must have had an accident, or he _A_ then. A would have been here B had to be here C should be here D would be here must have + 过去分词 表示对过去行为的肯定推测; 与过去事态相反用：情态动词 + have + 过去分词 来体现虚拟语气; must 一定，必须; neednt, dont have to 不必; 53. You _A_ all those calculations! We have a computer to do that sort of thing. A neednt have done B must not have done C shouldnt have done D can not have done should have + 过去分词 本应该，本应当; shouldnt have done本不应该，本不应当; 44. It was very kind of you to do the washing-up, but you _D_ it. A mustnt have done B wouldnt have done C mightnt have done D didnt have to do 52. It was essential that the applications forms _C_ back before the deadline. A must be sent B would be sent C be sent D were sent It be essential that 后面一定用虚拟语气，且句子谓语动词固定为 + 动词原型; It was essential that the applications forms send back before the deadline. 53. We _D_ our breakfast when an old man came to the door. | 
