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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1343

Not until ________a third time ________that he had given birth to the reading system for the blind called Braille.

A.Louis Braille tried;he announced
B.did Louis Braille try;he announced
C.Louis Braille had tried;did he announce
D.had Louis Braille tried;had he announced
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Notuntilathirdtimethathehadgiv