He was so interested in reading the book that three hours ha

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He was so interested in reading the book that three hours had passed ___he realized it a.until b.before

答案：b
解析：主句谓语动词强调动作的迟缓性,只用before,这时常伴有时间段状语或时间段暗示.
eg.
It was quite a long time before he found the elephant.过了很长时间,他才找到大象.
We had walked a long way before we found some water.走了很长的路我们才找到水.
We had sailed for two days before we saw the land.航行了两天我们才发现陆地.
It was midnight before my brother came home.我哥哥直到半夜才回来.

He was so interested in reading the book that three hours ha She was so interested in the book that she _____ it for thre The boy was so interested in the computer games that he forg 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 The book was so difficult that he read it for three hours___ 1：The book was so interesting that he had read it for three He was so ____ in reading the novel that he knew nothing abo 1.When was in college,he----spend several hours reading book he was so interested in it that he forgot to get off的THAT The lecture which lasted about three hours was so ____ that He spent two hours reading the book(改为同义句)