A number of people have posted their own videos on the website You Tube, ____________their attempts to become “musicians”.

A．to show

B．showing

C．showed

D．show

优秀代维办事处评选考评内容包括“（）”、“制度建设与落实”、“（）”、“沟通与交流”、“（）”和“工作绩效”六部分内容。