He did the right thing ___ for some fresh air even in cold winter.

A．to keep the chidlren from going out

B．to prevent the childern from going out

C．to keep the children going out

D．to prevent the children going out

2005年，在欧盟第五、第六研发框架计划支持下，欧洲未来电网SmartGrids技术平台正式启动。