My sister graduated from high school. Graduation was last night

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回复“零基础”即可！

昨日复习： 

In college I majored in science. What was your major?

我在大学主修科学，你主修什么？

今日课程：

My sister graduated from high school. Graduation was last night.

我的姐妹高中毕业了，昨晚开得毕业典礼。