问题
The farmer was very thankful to the doctor _________ saved his son．
A:whom
B:which
C:who
D:whose
B:which
C:who
D:whose
正确答案是：
同类题型
Tom usually _________ a bike to school. Look, he _______ to school now.
The classroom is _________ clean _______ it was yesterday. ——Sorry, I forgot to clean it.
Can you say something about Wenchuan earthquake (汶川地震)?—___________ people lost their lives in it.
All the students are talking and laughing in the classroom and it’s______ .