---Do you know the man is reading the book over there?-Yes he’s Mr. Green our PE teac

问题补充：

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

---Yes, he’s Mr. Green, our PE teacher.

A. which

B. what

C. whom

D. who

答案：

A. which

B. what

C. whom

(答案→)D. who

解析：who代指the man引导定语从句。整句理解：你认识那边读书的那个男士吗？是的。他是我们的体育老师，Mr Green.所以选D.