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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1127

Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.

A.when B.before C.while D.since
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Somepeoplegetintouchwitheachot