50. Many new _A_ will be opened up in the future for those with a university education. A opportunities B necessities C realities D probabilities
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;
52. 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;
53. 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
54. 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. A just have had B have just had C just had D had just had when 还可以表示①刚。。就 、②恰在此时;
55. I had just started back for the house to change my clothes _D_ I heard voices. A as B while C after D when 56. I felt somewhat disappointed and was about to leave, _C_ something occurred which attracted my attention. A unless B until C when D while 64. It was essential that these application forms _D_ back as early as possible. A must be sent B will be sent C are sent D be sent
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