:一、单项选择
1．We visited the teacher __________
taught us physics last Sunday.
A. who B. whom C. he D. which
2．Thats the Science Museum _________
we visited last year.
A. where B. to which C. which D. in which
3．Here is the girl ________ schoolbag
has been stolen.
A. who B. whom C. whose D. her
4．He is the most boring speaker
__________ I have ever heard.
A. whom B. that C. who Ｄ. which
