Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that

It was only when I left home that I realized how much my family meant to me.
(Dịch: Chỉ đến khi rời xa gia đình, tôi mới nhận ra gia đình có ý nghĩa với tôi đến nhường nào.)
=> Not until I left home did I realize how much my family meant to me.