UC知道he had finished his homework ________ 11:00. by at about 答案是by,为什么at不可以啊
来源：百度知道 编辑：UC知道 时间：2024/06/10 00:50:03
这几个搞不清楚啊
因为是he had finished 是在11:00以前就完成了,是过去完成时所以要用by
如果是he finished his homework 的话,就用at,
是一班过去时,为他在11;00时完成了他的作业.
OK?
因为 前面是过去完成时
这是完成时态，at多用于一般时态
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