– Are you free after school?
-- Sorry. I’ve planned to treat a friend of mine to dinner for his help.
A. in addition
B. in turn
C. in return
D. in total
网友回答
A. in addition
B. in turn
(答案→)C. in return
D. in total
解析：考查介词短语辨析。A另外；而且；B依次；轮流；C作为回报；D总共，共计；句意：—放学以后你有空吗？—对不起。作为对我的朋友帮助我的回报，我计划请这个朋友吃饭。根据句意说明C正确。