保证准确!
11. who/whom/不填(whom最佳)
12. who/whom/不填(whom最佳)
13. whose
14. whose
15. which/that
16. who
17. who/whom/不填(whom最佳)
18. which/that/不填
19. which
20. which/that/不填
21. which/that/不填
22. which/that/不填
23. that/不填
24. that/不填
25. that/不填
26. that/不填
27. that
28. that/不填
29. when 或 on which
30. where 或 in/at which
注:/ 表示可以任意选用其一.