模板1：过去没有完成的事情
Dear ，
I am writing this letter to apologize to you for my failing to .
The reason is that . I am sorry that I cannot finish in time, but is it possible that I make up the loss by ? If so, I will put everything else aside to .
I do hope that you can understand my situation and accept my apology.
Yours sincerely,
Li Ming
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