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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 238

---___________ 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