time is not far away __modern communications become widespread in China's vast countrysideA .as B.when C.while D.before答案是D但老师说是B,到底是什么啊?解释一下为什么不能用另外一个而用这一个,

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time is not far away __modern communications become widespread in China's vast countrysideA .as B.when C.while D.before答案是D但老师说是B,到底是什么啊?解释一下为什么不能用另外一个而用这一个,
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time is not far away __modern communications become widespread in China's vast countrysideA .as B.when C.while D.before答案是D但老师说是B,到底是什么啊?解释一下为什么不能用另外一个而用这一个,
time is not far away __modern communications become widespread in China's vast countryside
A .as B.when C.while D.before答案是D但老师说是B,到底是什么啊?解释一下为什么不能用另外一个而用这一个,

time is not far away __modern communications become widespread in China's vast countrysideA .as B.when C.while D.before答案是D但老师说是B,到底是什么啊?解释一下为什么不能用另外一个而用这一个,
语法上都是对的吧.
用B的话就是吧这个句子看成以个定语从句,WHEN引导的定从修饰THE TIME
而用D的化,before modern communications become widespread in China's vast countryside
充当时间状语了.
就是常见的not before那个短语,