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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1824

________ of my sisters are experts in agriculture. Helping the farmers improve their
farming techniques _________their duty.

A.Each; are B.Both; is C.Neither; are D.None; is
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ofmysistersareexpertsinagricul