通过（）能完成车辆路线模型、最短路径模型、网络物流模型等功能。

A.GPS

B.RF

C.EDI

D.GIS

— Is it my age ________the boss minds?

—I’m afraid so. He will consider ________ necessary to have an experienced assistant.

A．which；it

B．that；it

C．which；that

D．that；that