2. 一 I happened to meet Lily yesterday . 一 Lucky dog! You___
2. 一 I happened to meet Lily yesterday . 一 Lucky dog! You_____ each other for exactly two years. 2. 一 I happened to meet Lily yesterday. 一 Lucky dog! You_____ each other for exactly two years. A. haven't seen B. hadn't seen C. didn't see D. don't se 此题的答案是是B 为什么不能选A