-----Do you know the man is reading the book over there?------Yes he is Mr. Green o

问题补充：

-----Do you know the man is reading the book over there?

--------- Yes, he is Mr. Green, our P.E. teacher.

A. which

B. what

C. whom

D. who

答案：

A. which

B. what

C. whom

(答案→)D. who

解析：本题修饰man是一个定语从句，先行词表示人，关系词在从句中作主语，故关系词用who，故本题选D。