I took the jar (kept) on the counter and put it in my car,but then i met one of my workmates,whose l

题目

I took the jar (kept) on the counter and put it in my car,but then i met one of my workmates,whose license was lost,and he asked for a ride home.
这个为什么要用kept而不用to keep

答案

I took the jar ( which was kept) on the counter and put it in my car,but then i met one of my workmates,whose license was lost,and he asked for a ride home.
这里省略了定语成分“which was”,表状态.