参考答案和解析
正确答案：
Dear Mr. Brown,
I am writing to apologize for my failure to keep the appointment we made on Friday. I did set out by bike to meet you that afternoon, but unfortunately, I knocked an old lady down on the way and hurt her leg. I had no choice but to send her to hospital. I am sorry for any inconvenience this has caused to you. I can assure you that it will never happen again. I do need your help in writing my paper, so would you please give me another chance to discuss it with you? If so, please email me to suggest a time. Thank you.
Yours sincerely,
Li Ming
解析：
暂无解析
