A. Three groups of learners. B. The importance of business English. C. English for Specific Purposes. D. Features of English for different purposes. 参考答案:C 答案解析:主旨题。从整篇文章的内容看,主旨是介绍专门用途英语(English for specific purposes),即ESP,这些关键词,包括它的近义词specialist English也出现多次,贯