It is selfless ________ the doctor to devote all the time he had ________ for the patients.

A．for; to care

B．of; to care

C．for; to caring

D．of; to caring

从事道路危险货物运输车辆的《道路运输证》，其经营范围填写允许承运的危险货物运输的类别、（），但可以是多项。