单选题 Major manufacturers have been using "quality circle" with undeniable success for more them two decades.
  • A. 100 years
  • B. 20 years
  • C. 50 years
  • D. 10 years


【正确答案】 D
【答案解析】decade“十年”，主要的生产厂商已经运用“品质循环”无可否认的成功了不止20几年。