【正确答案】
Dear Jennifer,
It is with great regret that I am writing this letter of apology to you.
I now realize that I was entirely unjust in saying you were an unreliable person, which was solely based on misunderstanding. You promised to tutor my neighbour's child in English on Saturday but didn't come. Later it came to me that you were only helping send an old lady to hospital.
How regretful I was when I knew that I had wronged you! It's my sincere hope that my unfair remarks will not harm our friendship. Now I beg to withdraw my rash statement about you. Please accept my sincere apology.

【答案解析】[写作要点]
(i) 道歉信的正文一般可分三段来写：第一段首先明确表示信函性质即表明这是道歉信；第二段具体说明道歉原因(即事件经过)；第三段表明对对方的歉意，请求对方原谅。
(ii) 道歉信语言要求较为规范和朴实，要让对方能够感觉到道歉的真诚。对自己犯错的原因的说明不要太多，以免给人留下为自己脱责的印象。