状语从句 when和before

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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

efore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.

状语从句 when和before when、while、until、after、before、as soon as引导时间状语从句是的主句和从句的时态是怎如何区分when.while.as.before after.as soon as until时间状语从句的主句和从句时间状语从句造句,用before,after,hadly,when,造句 when和while引导时间状语从句关于时间状语从句中 before和after的区别 when引导宾语从句和状语从句的区别 when引导的状语从句,主句和从句是什么时态 before 引导时间状语从句英语时间状语从句 when ,while ,before ,until 区别及每个的特殊用法状语从句中“when while as soon as before”等引导词的区分. as soon as,when,while,before,after,until引导的时间状语从句的用法