状语从句 when和beforeShe was so absorbed in the book that she had read it for three hours _ she realized it. A.when B.until C.after D.before

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状语从句 when和beforeShe was so absorbed in the book that she had read it for three hours _ she realized it. A.when B.until C.after D.before
状语从句 when和before
She was so absorbed in the book that she had read it for three hours _ she realized it. A.when B.until C.after D.before

状语从句 when和beforeShe was so absorbed in the book that she had read it for three hours _ she realized it. A.when B.until C.after D.before
before表示“不知不觉,还没弄清就……”(常用于before sb.know／realize…)
用when则无法强调时间流逝的不知不觉性.
又如：Time passed quickly and three months went by before I knew it.时间飞快地流逝,不知不觉3个月过去了.

选A，
当她意识到的时候，她已经读了3小时了；
假如是before，那么就是在她意识到之前，中文经常这么说，但英文是不符合逻辑的。
当她意识到之前就是还没意识到，还没意识到又怎么会知道读了多久呢。所以得是当她意识到时，才能知道读了3小时了。...

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选A，
当她意识到的时候，她已经读了3小时了；
假如是before，那么就是在她意识到之前，中文经常这么说，但英文是不符合逻辑的。
当她意识到之前就是还没意识到，还没意识到又怎么会知道读了多久呢。所以得是当她意识到时，才能知道读了3小时了。

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