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Dear Mr/Mrs/Ms XXX(teacher):
I am writing this letter to ask for your pardon for my absence in your class.
As CET-6 is around the corner,I realized how much I am lagged behind for my preparation schedule. The only choice I have is to borrow some time from my classes f

Thank you for your understanding and I do appreciate ir very much. I will make every effort in making up what I may miss from your lesson.
Yours
XXX