A
(2018·辽宁辽南第一次模拟)假定你是李华，你和美国留学生Tony相约通过网上交流学习彼此的语言，经过一年的交流学习，彼此都取得了进步，但由于高三下学期学习时间紧张，你无法再抽出时间上网与他交流。请你给Tony写一封e-mail，表达对他的歉意。
主要内容：
1．表达歉意；
2．说明具体原因、提出补救办法；
3．希望得到谅解。
注意：1．词数100左右；
2．可以适当增加细节，以使行文连贯。
【参考范文】
Dear Tony，
I am extremely sorry to tell you that I'm unable to carry on helping you learn Chinese.Words fail me to show my deep regret.
It is for one year that we have helped each other.I am grateful for your selfless and effective guidance，without which I couldn't make such amazing advances in English.However，it won't be a long time before I am faced with a significant challenge，the College Entrance Examination.With my over-all energy devoted to revision，I have no time to surf the Internet.The fact that I can't communicate with you makes me regretful.I hope that we can learn from each other after the exam.
I would appreciate your understanding and forgiveness.Hoping to study with you online soon.
Best wishes!
Yours truly，
Li Hua
