IT WAS ONLY WHEN HE LEFT HOME THAT HE REALIZED HOW MUCH HIS FATHER...

58. It was only when he left home that he realized how much his father meant to him.

A. Not only did he leave home that he realized how much his father meant to him.

B. Not until he left home did he realize how much his father meant to him.

C. Not until did he leave home had he realized how much his father meant to him.

D. Not until he had left home that he realized how much his father meant to him.