All the task __________ ahead of time, so they decided to go on holiday for a week.

A．having finished

B．had finished

C．having been finished

D．had been finished

在系统评价中，开发方最关注的评价指标是

A．项目的开发和运行成本

B．技术与质量指标的评价

C．系统功能和运行质量

D．直接和间接经济效益