在英语语法中，定语从句是一种非常重要的结构，它能够帮助我们更清晰地表达句子中的信息。下面是一组精心挑选的定语从句专项练习题，旨在帮助大家更好地理解和掌握这一语法点。
1. The book ________ I bought yesterday is very interesting.
A. who B. whom C. which D. whose
2. This is the house ________ was built last year.
A. that B. when C. where D. who
3. Do you know the man ________ is standing at the gate?
A. which B. who C. whom D. whose
4. The girl ________ mother works in this hospital is my classmate.
A. which B. who C. whose D. what
5. Is there anything ________ I can do for you?
A. which B. who C. that D. whose
6. The man ________ gave us a speech yesterday is from America.
A. who B. whom C. whose D. which
7. The book ________ is on the desk belongs to me.
A. who B. whom C. which D. whose
8. He is one of the students ________ have won the prize.
A. who B. whom C. whose D. which
9. The factory ________ produces cars is very famous.
A. where B. which C. who D. whose
10. The girl ________ hair is long is my sister.
A. who B. whom C. whose D. which
11. The boy ________ father is a teacher is my friend.
A. who B. whom C. whose D. which
12. The letter ________ I received yesterday was from my friend.
A. who B. whom C. which D. whose
13. The city ________ I visited last summer is very beautiful.
A. that B. which C. where D. who
14. The movie ________ we watched last night was very exciting.
A. who B. whom C. which D. whose
15. The teacher ________ is talking with the students is Mr. Zhang.
A. who B. whom C. whose D. which
16. The book ________ you are reading belongs to Mary.
A. who B. whom C. which D. whose
17. The place ________ they had their picnic is near the river.
A. that B. which C. where D. who
18. The woman ________ children are all grown up is my aunt.
A. who B. whom C. whose D. which
19. The book ________ cover is red is mine.
A. who B. whom C. which D. whose
20. The man ________ you met just now is my uncle.
A. who B. whom C. whose D. which
21. The school ________ he graduated from is famous.
A. where B. which C. who D. whose
22. The man ________ is sitting over there is a doctor.
A. who B. whom C. whose D. which
23. The car ________ is parked outside is new.
A. which B. who C. whom D. whose
24. The book ________ is lying on the table is mine.
A. who B. whom C. which D. whose
25. The girl ________ I spoke to is my cousin.
A. who B. whom C. whose D. which
26. The factory ________ produces computers is large.
A. where B. which C. who D. whose
27. The letter ________ I wrote yesterday was short.
A. who B. whom C. which D. whose
28. The man ________ you shook hands with is my boss.
A. who B. whom C. whose D. which
29. The book ________ cover is torn is old.
A. who B. whom C. which D. whose
30. The girl ________ parents are teachers is my neighbor.
A. who B. whom C. whose D. which
以上就是30道定语从句的练习题，希望大家通过这些题目能够更加熟练地运用定语从句。记住，在选择关系代词时，要根据先行词的不同来决定使用哪个选项。例如，当先行词是人时，通常使用who或whom；当先行词是物时，通常使用which或that。希望这些题目对大家有所帮助！
