BEFORE AS WHILE

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/07/30 22:07:18

She crossed a large area of grassland into the woods _____ she realished that she was lost. A.before Bsince. C while Das 为什么选A？选A前面不是就应该是had crossed 了么？为什么不能用while?? while的一个用法不是和when相同吗?

解题思路：如下
解题过程：
选A。此题考查before的用法。before含有"在……之前……；过多久才..."之意,说明主句的持续时间比较长而从句的动作缓缓来迟。根据句意：她穿过一大片草地进入树林才意识到她迷路了。其它词不符合题意,所以选A。
再如：
Several weeks had gone by before I realized the painting was missing.
before 表示“过多久才……”。句意：几个星期已经过去了，我才意识到油画丢了。内含的意思是油画丢了好几个星期了，我才意识到。
最终答案：略

用after、 before 、if 、when、 while 、as soon as 填空 while,when,until,after,before,as soon as 怎么用? when while before after as soon as until填空用when,while,as soon as,until,before,after填空 when,while,as soon as,before,after的区别一.选用before,after,until,while,when,as填空 A) before B) while C) as D) after when,while ,until,till ,as soon as ,as ,after ,before,引导的时间状连词before,until,while,as,since,as soon as,after的用法用since,as,when,as soon as,while,if,after,before,until或becaus 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