定语从句 (13次)
1. N(先行词：被修饰名词) + 定语从句(关系代词 /关系副词 + 句子)
2. 关系代词： who/whom 先行词是人
which 先行词是物
that 先行词不论人或物
3. 关系代词在定语从句中做主语，不能省略;做宾语，可以省略。
1. I used to live in a house ______ is big and bright.
A. that B. who C. how D. why
2. The man ______ is wearing a blue jacket is from the south.
A. which B. whom C. who D. -
3. The computer ______ I bought only a week ago broke down today.
A. what B. who C. which D. whom
