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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 2028

Only when he read the newspaper _____ the US President Obama would deliver a speech in his university.

A.he knew B.he had known
C.had he known D.did he know
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OnlywhenhereadthenewspapertheU