of danger in the street last night she had to go home with a friend following her.A. To

问题补充：

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

A. To be warned

B. Warned

C. Having warned

D. Warning

答案：

A. To be warned

(答案→)B. Warned

C. Having warned

D. Warning

解析：考查非谓语动词。warned 过去分词作状语，表被动

句意为，被警告这条街晚上很危险，她只能和他的朋友一起回家。