◎ 题干
— Isn't it a surprise that I happened to meet Emily at Doris' birthday party last weekend?  
— If my memory serves me correctly, you        each other for exactly three years.
[     ]
A. hadn't seen
B. haven't seen
C. didn't see
D. don't see
◎ 答案
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◎ 解析
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◎ 知识点
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