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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 295

— There's someone outside. Who it be ?
— It must be Mary. She promised to come over at 8: 00.

A.must B.can C.shall D.need
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—Theressomeoneoutside.Whoitbe?