of danger in the street at night she had to go home with a friend her.A. Warning fol

问题补充：

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

A. Warning, following

B. Having warned, following

C. Having been warned, following

D. Warned, followed

答案：

A. Warning, following

B. Having warned, following

(答案→)C. Having been warned, following

D. Warned, followed

解析：warn这一动作发生在主句动作had to go之前，应用-ing的完成形式，且与主句的主语存在着被动关系；a friend与follow之间是主动关系。故选C。