had been to 是什么時(shí)態(tài)

　　Oh, I had been to the airport that time.

　　哦，那時(shí)我已經(jīng)去機(jī)場(chǎng)了。

　　My friend learned that the police had been to the flats.

　　我的朋友得知警察來(lái)過(guò)大樓。

　　I had been to Penn only one day, in October of my senior year.

　　我只在賓夕法尼亞州立大學(xué)呆過(guò)一天，那是在我畢業(yè)那年的十月份。