雅思G类作文TASK1要点讲解(二)三.书信的常用语A 投诉信信头:1.I am writing to complain about a serious defect found in the computer I bought from you.2. I am writing to notify you of a claim for damaged goods against your company.3.I am wiring to request you to take corrective actions concerning .4. I am writing to express my concern/dissatisfaction about5. I would like o draw your attention to6. It has come to my attention that7. A very serious problem has arisen in connecti
