The computers made by our company sell best, but several years ago no one could have imagined the role in the markets that they ________.

A．were playing

B．were to play

C．had played

D．played

商业用地注重交通运输程度、基础设施完善度、产业集聚规模、工业区位、环境质量、城市规划限制、区域内劳动力供求情况、工资酬劳水平等方面诸多因素的影响。______