1：The book was so interesting that he had read it for three

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1：The book was so interesting that he had read it for three hours ___ he realized it.　A.when 　B.until C.after D.before 　　2.Who cleaned the blackboard yesterday,Dick?　　-John___.　　　A.cleaned　B.did　　C.does　　D.is 　　　　还有,表示在物体的外部的东部怎么表达?

第一个选D,有had了,这是过去的过去完成时,与before搭配.
第二个选B,did 代指 cleaned the blackboard（擦黑板）这件事,因为是昨天发生的,所以用过去时did.

1：The book was so interesting that he had read it for three 英语：The book was so interesting that he had read it for three the book was so interesting that he had read it for three ho 一个初中英语题目The book was so interesting that he had read it for 34页60.The book was so interesting that he had read it for th P9 9.The book was so interesting that he had read it for thr 23页50.the】 book was so interesting that he had read it for t The English book was so interesting that she had read it for The book was so difficult that he read it for three hours___ 2.The book is so interesting that i want to read it for seco The book was so interesting that she found herself____ it It was so interesting a book that all of us read it several