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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:1238

--Have you ever been here before?
---Well, I once _________ here for four years. Those days are really unforgettable.

A.have stayed B.had stayed C.have been staying D.stayed
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Haveyoueverbeenherebefore?Well