The book was so interesting that he had read it for three hours___he realized it.为什么选before而不选until?

来源:学生作业学帮网 编辑:学帮网 时间:2024/05/15 03:47:31

The book was so interesting that he had read it for three hours___he realized it.
为什么选before而不选until?

根据句意,until不通,且其一般与not连用表示“直到……才……”句意是:这本书如此有趣以至于他在理解之前已经读了三小时.