物流系统生存战略属于按（）划分的物流战略类型

A.发展方向

B.服务项目

C.战略行为

D.战略重点

My father _______ to Shanghai. He _______ for over 2 months.

A．has been, has left

B．has gone, has gone

C．has gone, has been away

D．has been, has gone