_ 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

分类: 作业答案 • 2022-01-09 18:04:15

问题描述：

_____ 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

答

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

_____ 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