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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 653

I haven't seen Anna since she left our hometown two years ago, but we do keep in touch with each other by sending e-mails __________.

A.here and there
B.sooner or later
C.at one time
D.now and then
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IhaventseenAnnasincesheleftour