Out _________, still discussing the fashion show with great interest.

A．walked a crowd of young girls

B．did a crowd of young girls walk

C．were walking a crowd of young girls

D．a crowd of young girls were walking

电流速断保护（）

A、能保护线路全长

B、不能保护线路全长

C、有时能保护线路全长

D、能保护线路全长并延伸至下一段