Question

--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

Answer 1

D

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。