单选题 He isn't legally responsible for his nephew, but he feels he has a moral ______ to help him.
  • A. observation
  • B. obligation
  • C. objection
  • D. obstruction
【正确答案】 B
【答案解析】[解析] 四个选项的意思分别是：obligation责任，义务；observation观察评论；objection反对，异议；obstruction妨碍，阻挠。句意是，从法律意义上来说，他对他的侄子不承担责任，但是他觉得自己有帮助他的道德义务。所以正确答案是B选项。