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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1953

— They speak perfect English. How long have they learnt it?
— ______ they were seven years old.

A.Since B.When
C.After D.Until
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—TheyspeakperfectEnglish.Howlo