在初中英语学习过程中，定语从句是一个重要的语法知识点。它能够帮助我们更准确地描述事物或人物，使句子表达更加丰富和具体。为了更好地掌握这一语法点，下面为大家整理了一份定语从句专项练习题，希望对大家的学习有所帮助。
一、基础知识回顾
定语从句是用来修饰名词或代词的句子部分，通常由关系代词（如who, whom, whose, which, that）或关系副词（如where, when, why）引导。关系代词在从句中可以充当主语、宾语或定语；而关系副词则用来表示时间、地点或原因。
例句：
- The boy who is playing basketball is my friend.
- This is the book which I bought yesterday.
二、专项练习题
请根据上下文选择正确的选项完成以下句子。
1. The man _________ gave us a speech last week is from China.
A. who B. whom C. whose D. which
2. The girl _________ hair is long and black is my sister.
A. who B. whom C. whose D. which
3. Do you know the place _________ we had our picnic?
A. where B. when C. why D. what
4. The reason _________ he was late was that his bike broke down.
A. why B. because C. for D. which
5. She is the only person _________ I can trust.
A. who B. whom C. whose D. which
6. The book _________ I borrowed from the library is very interesting.
A. that B. which C. where D. when
7. The movie _________ we watched last night was fantastic.
A. what B. that C. where D. who
8. The teacher _________ often helps me with my English is very kind.
A. who B. whom C. whose D. which
9. The day _________ we first met was unforgettable.
A. when B. where C. why D. how
10. This is the house _________ my grandfather used to live.
A. where B. when C. which D. who
三、参考答案
1. A 2. C 3. A 4. A 5. A
6. A 7. B 8. A 9. A 10. A
通过以上练习题，希望大家能够巩固对定语从句的理解，并熟练运用到实际的语言表达中去。如果还有疑问，欢迎随时查阅相关资料或向老师请教！加油！
