题干
---Isn’t it a surprise that I happened to meet Francis Mathews at the Christmas Party last week?
---If my memory serves me correctly, you _____ each other for exactly two years.
---If my memory serves me correctly, you _____ each other for exactly two years.
A：hadn’t see
B：haven’t see
C：didn’t see
D：don’t see
答案(点此获取答案解析）
A
的展开式中
的系数是（ ）