问题标题:
【选择:Youhavebeendoingwashingallthemorning.Youmustbetired,()you?A.mustn`tB.areC.aren`tD.must】
问题描述:

选择:Youhavebeendoingwashingallthemorning.Youmustbetired,()you?

A.mustn`tB.areC.aren`tD.must

江鸿回答:
  Youhavebeendoingwashingallthemorning.Youmustbetired,(aren't)you?表示肯定猜测.
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