I had lived there for over thirty years __i wanted to turn to my motherland again.为什么选when?

题目

I had lived there for over thirty years __i wanted to turn to my motherland again.为什么选when?
I had lived there for over thirty years __i wanted to turn to my motherland again.
A until B after C while D when
为什么选when?
为什么不能选A?

答案

until一般和否定句连用,比如not…until,肯定句一般用till