Yap.Town

に行ってたの

went to …?

→ に
phrase Rare #42,355
went to …? A casual question about where someone went or was. 行ってた is a shortened form of 行っていた.
JA: 昨日、どこに行ってたの？
EN: Where were you yesterday?

北海道に行ってたの？

Were you in Hokkaido?

昨日の午後は誰のところに行ってたの？

Whose place were you at yesterday afternoon?

今日、トムは学校に行ってたの？

Was Tom at school today?

コンサートに行ってたの？

Were you at a concert?