题干
—Kate！Have you got an invitation(请柬) from Nancy?
—_____. A what?
A：Yes, I’ve got one
B：I’m sorry I don’t know
C：Say agai
D：I beg your pardo
答案(点此获取答案解析）
D
A：Yes, I’ve got one
B：I’m sorry I don’t know
C：Say agai
D：I beg your pardo
满足
则
的最小值是（ ）