题目内容：
Directions: Suppose that Sarah, a friend of yours, has invited you to her birthday party, but you cannot go for some reason. Write a letter in about80 words to make an apology to her. Do not sign your own name at the end of your letter, using “Li Ming” instead. 假使你是李明，要写一封道歉信，相关内容如下：1．写信的目的-----道歉去不了她的生日宴会2．缺席的理由3．希望能获得原谅参考答案：