以下十个句子可以用于投诉信的开头或者结尾,请把它们归类: A. I am writing to complain about a serious defect found in the computer I bought from you. B. I am writing to request a full refund of the course fee I have paid. C. I believe this matter can be resolved quickly and look forward to your early reply. D. If this matter is not put right soon, I fear it could have serious consequences. E. I am writing to notify you of a claim for damaged goods against your company. F. If I do not hear from you within the next seven days, I will have no option but to go the city council to have my complaint heard. G. I look forward to receiving a replacement as soon as possible. H. A very serious problem has arisen in connection with a language course you provided and operated. I. I am wondering if it would be possible for us to meet and discuss the situation. J. I would like to draw you attention to the attitude of your front-desk receptionist towards the guests. 可用于投诉信 开头 部分的句子:(1)____;(2)____;(3)____;(4)____;(5)____ 可用于投诉信 结尾 部分的句子:(6)____;(7)____;(8)____;(9)____;(10)____