The book was so difficult that he read it for three hours______he understood it.A.whenB.untilC.afterD.before请问为什么选until详细说明下.还有为什么不是that he has read it for three hoursfor应该是用完成时啊?

改错1.She brought the book to her home.2.Zhang lin was a good girl.So was she. when was the book published? the book was bought yesterday. so great was the success of the book that they made it into a film分析下句子成分 He was so interested in reading the book that three hours had passed ___he realized it a.until b.before Who do you think _ A did the book write B was the book written C was the book written byA did the book writeB was the book writtenC was the book written byD the book was written by I like the book so much. by who was the book written When was the writer ofthe book b____? The book was e____ what I wanted. The book was a great success. It was said in the book so interesting is the book能不能换成so interesting the book is 结果状语从句!He was abosrbed in the book so much that he didn;t hear the voice.有错误么?这样虽然不地道，但是对吗、 it was said______he was translating the book into Chinese. who was the book weitten by?和whom was the book written by?有什么区别? Whom was the book---?Who was the book---?A.wroteB.writtenC.written by选B对吗? The English book was so interesting that she had read it for 3hours_she realized.A.when B.until C.befor D.after为什么选C