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  • 科目:英语
  • 题型:单选题
  • 难度:容易
  • 人气:629

---There is somebody knocking at the door. Who________ it be?
---I’m not sure. It ________ be a postman.

A.may; must B.will; can C.can; may D.may; will
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Thereissomebodyknockingatthedo