Sum-up We learned from this unit first of all the general problems the business people may come across in placing an order, then focus on how to deal with some after-sales problems, at last, practice how to complain about the problems and how to make an apology, both in spoken form and written form 返回Sum-up We learned from this unit first of all the general problems the business people may come across in placing an order, then focus on how to deal with some after-sales problems, at last, practice how to complain about the problems and how to make an apology, both in spoken form and written form. 返 回