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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1474

The old man has two sons, ____________ are working in the supermarket.

A.both of whom B.each of them
C.both of them D.all of whom
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Theoldmanhastwosons,areworking