--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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--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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