The man gave us a talk on science yesterday is a famous scientist.A. whoB. whoseC. wonD.

问题补充：

The man gave us a talk on science yesterday is a famous scientist.

A. who

B. whose

C. won

D. Watched

答案：

(答案→)A. who

B. whose

C. won

D. Watched

解析：句意：昨天在学术会上给我们作报告的人是一位著名的科学家。在定语从句中，能代替人且做从句的主语，应用who。