-Are you free after school?-Sorry．I've planned to treat a friend of mine to dinner ________ for his help．A.in additionB.in turnC.in returnD.in total
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C解析考查短语辨析。in return作为(对……的)回报。treat a friend of mine to dinner in return for his help意为“请我的一位朋友吃饭来回报他对我的帮助”。in addition此外；in turn轮流，又(对别人)做同样的事；in total总共。