--Have you ever been here before?
---Well, I once _________ here for four years. Those days are really unforgettable.
A．have stayedB．had stayedC．have been stayingD．stayed
D
考查時態(tài)。根據(jù)語境及時間狀語for four years可知，用一般過去時。句意：——你以前來過這里么？——嗯，我在這里呆過四年，那些歲月真的難忘。
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