一道初中英语语法题,

题目

一道初中英语语法题,
She (not go) to bed until she (finish) doing her homework.
我觉得是 won't go 和 finishes 如不对,请说明理由

答案

不对
didn't go...finished
很显然说这话的时候这事已经过去了.所以用过去时.