英语四级词汇课堂笔记完整版_大学英语单词

　　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.

　　A just have had B have just had C just had D had just had

　　when 还可以表示①刚..就 (有动作先后关系)、②恰在此时;

　　44. I had just started back for the house to change my clothes _D_ I heard voices.

　　A as B while C after D when

　　45. 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

　　第2课

　　非谓语动词与独立主格：短语，句子(或者句子，短语)

　　1.当短语部分有独立主语，并且该主语不同于句子主语，这时短语结构称为独立主格。(它最明显的特点是短语部分有独立的主语)。

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