单选题 They are endeavoring to change society as a whole.
  • A. trying
  • B. working
  • C. doing
  • D. making


【正确答案】 A
【答案解析】[解析] endeavor to do something和try to do都表示“努力做某事”；work(工作)、do(做)和make(制作)都没有这个用法。