_ recently _ scientists known something about AIDS.

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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

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. Scientists didn’t know much about lung cancer _____. now _____ me say something about myself. tell me something about _____(you) I suppose they have known about it,_____ At first,they got _____ about something and _____ _____ ____ _____ you _____any films recently? You should know something about fire _____(save) -----Let do something at the party--what about _____?-----No You _____ tell me something about your school Can you see something about thia _____ machine? Can you tell something about the accident _____ yesterday?