我那天缺课了，因为我不知道课已经提前到了周四。
I missed that day, because I don't know that class already's early Thursday.
我那天缺课了，因为我不知道课已经提前到了周四。
The day that I was absent from school, because I don't know the class had already arrived early Thursday.
我那天缺课了，因为我不知道课已经提前到了周四。
The day that I was absent from school, because I don't know the class had already arrived early Thursday.
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