Li Na returned to Wuhan after the Games,________, as is known to us, she had been brought up and

trained to be a gold medalist of tennis.[ ]

A. when  

B. that  

C. there  

D. where

集成系统应满足以下哪些配置要求（）

A、应实现对各智能化系统进行综合管理

B、可支撑工作业务系统及物业管理系统

C、采用当前主流操作系统

D、应具有可千性、容错性、易维护性和可扩展性