单选题 As the elevator is ______, you have to walk upstairs to my office.
  • A. out of stock
  • B. out of order
  • C. out of mind
  • D. out of place
【正确答案】 B
【答案解析】out of stock：已售完，无存货；out of order：坏了，有毛病；out of mind：疯了，神经不正常；out of place：不合适。