She didn't finished her homework until I returned.(didn't后为何不用原型,跟not until有关吗?）就是此处finished为何不是原型

She didn't finished her homework until I returned.(didn't后为何不用原型,跟not until有关吗?）
就是此处finished为何不是原型

题目出错了,应该是原型

你现在讲这句话时，你return这件事已经过去了了，

就是原型，题错了。