_____ of the danger in the street at night, she had to go home, with a friend _____ her.

A．Warned; followed

B．Warned; following

C．Having warned; followed

D．Having warned; following

医院领导必须深入到医疗第一线进行调查研究，掌握第一手资料，从而获得领导工作的主动权，行使各项管理职能。（）