He isn't such a man _____ he used to be.

[     ]

A. who

B. whom

C. that

D. as

答案

D

知识点

关系代词的定义

关系代词的概念：

英语中的关系代词有who, whom, whose, that, which, 它们是用来引导定语从句的。关系代词既代表定语从句所修饰的词，又在其所引导的从句中承担一个成分，如主语、宾语、表语、或定语。

如：This is the man who saved your son. (who在从句中作主语，先行词是man）

The man whom I met yesterday is Jim.

A child whose parents are dead is an orphan.

He wants a room whose window looks out over the sea.

关系代词的知识扩展

1、关系代词用来引导定语从句。它代表先行词，同时在从句中作一定的句子成分，例如：

The girl to whom I spoke is my cousin.　跟我讲话的姑娘是我表妹。（该句中whom

既代表先行词the girl，又在从句中作介词to的宾语。）