单选题 That kind of personal experience {{U}}can never be forgotten{{/U}} all his life, which consists of a great deal of lessons for a man as an individual.
  • A. is utterly indelible
  • B. is totally incredible
  • C. can be the most intangible
  • D. can be the most imperceptible
【正确答案】 A
【答案解析】indelible是个大词，意即hard to be forgoten。