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The teacher_(not teach)us a chinese song,he_(teach)us an eng

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The teacher_(not teach)us a chinese song,he_(teach)us an english song two days ago.
填什么?为什么?
The teacher_(not teach)us a chinese song,he_(teach)us an eng
didn't teach,taught
two days ago 表示:两天前,是过去时间,所以用一般过去时态.
再问: hasn't taught,taught和didn't teach, taught一样吗?它们有什么区别?
再答: hasn't taught 是用的现在完成时,didn't teach用的是一般过去时,这两者时态不一致。