(2014·河南郑州高中毕业年级质量预测)Helen has been looking for a job over the whole year，feeling she can’t get________without work experience.

A．one　

B．it

C．that　

D．this

提高Catalyst 6500发生间接链路失效的收敛速度，正确配置STP可选功能的命令是（）。

A．set spantree backbonefast enable

B．set spantree uplinkfast enable

C．set spantree portfast 3/2 enable

D．set spantree portfast bpdu-filter enable