HE DIDN’T KNOW ANYTHING ABOUT IT UNTIL HE WAS EIGHTEEN

26/He didn’t know anything about it until he was eighteen .

a/It was not until was he eighteen that he knew something about it .

b/ It was not until he was eighteen that he knew something about it .

c/ It was until he was eighteen that he knew something about it .

d/ It was until was he eighteen that he knew something about it .