问题补充：
of danger in the street at night, she had to go home, with a friend her.
A. Warned; accompanied
B. Warning; accompanying
C. Having warned; accompanied
D. Having been warned; accompanying
答案：
A. Warned; accompanied
B. Warning; accompanying
C. Having warned; accompanied
(答案→)D. Having been warned; accompanying
解析：考查分词用法。She与warn构成被动关系，所以使用过去分词或者having been done,第二空的friend与accompany构成主动关系，使用现在分词。句意：因为被警告晚上的街上有危险，所以她不得不让一个朋友陪她一起回家。
