2. The letter _______ I received from him
yesterday is very important.
A. who B. where C. what D. that
[解析]答案:D。该题考查的是定语从句的关系代词的选择。因为先行词是物,而关系代词在定语从句中作宾语,所以只有that合适。
3---Where is the scientist ________ gave us the talk yesterday?
---He has gone back to Qinghua
University.
A. whom B. who C. whose D. which
[解析]答案:B。该题考查的是引导定语从句的关系代词的选择。因为先行词是人,而关系代词又在定语从句中作主语,所以只有who合适。