It's been a while since you came to preschool last.
It's been a while since you went to preschool last.
「今日は久しぶりの保育園だね！」は、
保育園では
It's been a while since you came to preschool last.
It's been a while 久しぶりだね
since you came to preschool last あなたが最後に保育園に来てから
家では、
It's been a while since you went to preschool last.
It's been a while 久しぶりだね
since you went to preschool last あなたが最後に保育園に行ってから
が、言いやすいと思います。
Today is your first day back at preschool in quite a while.
It's been a long time since you were at preschool.
この場合、次のような言い方ができますよ。
ーToday is your first day back at preschool in quite a while.
「今日は暫くぶりに保育園に戻る最初の日です」＝「保育園に行くの久しぶりだね」
ーIt's been a long time since you were at preschool.
「保育園に行ってから暫く時間が経ちました」＝「保育園に行くの久しぶりだね」
ご参考まで！
アメリカ合衆国 
カナダ 
