－What do you think of Peter?－He is a helpful person. He is always helping people without e

问题补充：

－What do you think of Peter?

－He is a helpful person. He is always helping people without expecting anything.

A. in turn

B. in return

C. on his turn

D. on the turn

答案：

A. in turn

(答案→)B. in return

C. on his turn

D. on the turn

解析：本题回答语的含义是他是一个乐于助人的人，总是帮助别人而不指望回报，in return表示回报的意思，故本题选B。