_____ recently _____ scientists known something about AIDS.[A]Not until…have [B] Until…did [C] Not until…do [D] Until…have解释为什么 翻译整句

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_____ recently _____ scientists known something about AIDS.[A]Not until…have [B] Until…did   [C] Not until…do [D] Until…have解释为什么     翻译整句

_____ recently _____ scientists known something about AIDS.[A]Not until…have [B] Until…did [C] Not until…do [D] Until…have解释为什么 翻译整句
_____ recently _____ scientists known something about AIDS.
[A]Not until…have [B] Until…did [C] Not until…do [D] Until…have
解释为什么
翻译整句

_____ recently _____ scientists known something about AIDS.[A]Not until…have [B] Until…did [C] Not until…do [D] Until…have解释为什么 翻译整句
A not … until … 是一个句型,直到…才
因句中有known ,所以是完成时态
直到最近,科学家才知道一些与艾滋病有关的东西