D D：自从 其他选项代入不合题意
A A：无论什么 B：无论哪个 BCD代入都不合题意
B 结构与前面并列 故而应选what 这里all that=what 具体看：
B when引导定语从句
2.when引导定语从句表示时间〔注〕值得一提的是,表示时间“time"一词的定语从句只用when引导,有时不用任何关系代词,当然也不用that引导.
C not..until...的变种 把not 放到了后面
so强调的是一种逻辑关系,而so that用来说明做某事的目的.
1 ______the world began,nations have had difficulty in keepi
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