Hey There!!
Your best answer choice will be is Were.
Because You were the most important person at the time makes sense. But, If you put You was the important person at the time doesn't make sense at all... Hope This Helps!!
By ♡~Itsbrazts♡~
Any source that distributes information to a large audience
where are the lines?
By the way underlined depicts a word or phrase marked with a line under it...
Though Robert was more reserved, he enjoyed the sparkle that Clara’s vivacious personality brought to the situations they experienced.
Well family is bery important because they care for you and love you and take care of you for example i am in high school right now they give me good advice and help me a lot they encourage me to study and to try my best thats why you need family