题干
一 Is that Jack speaking?
一 Sorry, he isn't in right now. He the cinema with his aunt.
A：has been to
B：has gone to
C：have been to
D：have gone to
答案(点此获取答案解析）
B
为抛物线
的焦点，
为原点，点
是抛物线准线上一动点，点
在抛物线上，且
，则
的最小值为 （ ）