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:考查非谓语动词用法。Warn与she之间构成被动关系,所以使用过去分词表示被动,排除BC。Warned和Having been warned都可以,第二空的friend与follow构成主动关系,故使用现在分词的形式,故C正确。