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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1966

By the time Billy was 6, he         in the sea.

A.had already swum B.was already swimming
C.has already swum D.already swam
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BythetimeBillywas6,heinthesea.