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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 398

---___________ do they visit their old friends?
---Once a year.
A How long                      B How often
C How many times                D How much time

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dotheyvisittheiroldfriends?Onc