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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:2006

— Mum, my friends are waiting for me outside. May I go out to play with them?
— Yes, you        , but be careful, please.

A.shall B.must C.may D.should
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—Mum,myfriendsarewaitingformeo