--Have you ever been here before? --Well, I once _________ here for four years. Those days are really unforgettableA.have stayedB.had stayedC.have been stayingD.stayed
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D解析考查时态。根据语境及时间状语for four years可知，用一般过去时。句意：——你以前来过这里么？——嗯，我在这里呆过四年，那些岁月真的难忘。