Question

---You are late . What’s the matter ?
---I helped an old man _______ lost his way home .

A． who

B． whose

C． whom

D． which

Answer 1

A

试题分析：考查的四个选项是定语从句的关系代词，指人的用who（主格）/whom（宾格）。原句意思是：你迟到了，怎么回事？我帮助了一个在回家路上迷路了老人。从句子的结构可以看出关系代词在宾语从句中作主语，故选A。