【题目】He has given me so much help that I really want to do some for him __________.
A. in turn B. by turns
C. in return D. in answer
在线课程【答案】C
【解析】考查短语辨析.句意：我的物理老师给了我如此多的帮助.我真想为他做点事作为回报。A. in turn 依次； B. by turns轮流；C. in return 作为报答； D. in answer回答。可知答案为C。