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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1344

I _____ his telephone number. Had I known it, I would have rung him up.

A.don’t known B.didn’t know
C.hadn’t known D.haven’t known
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相关知识点

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