He didn't go to bed until he finished his homework

He didn't go to bed until he finished his homework
为什么finish 要是过去时的啊?不是 didn't 后面跟原型吗?
英语人气:670 ℃时间:2019-11-11 15:18:44
优质解答
这里相当于两句话He didn't go to bed
he finished his homework
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