---This is my treat and next is yours． How's that?
---OK．______．A.It doesn't matterB.It dependsC.No wayD.It's a deal
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D解析试题分析：考查交际用语：A． It doesn't matter没关系，B． It depends那就看情况而定了，C． No way没门，D． It's a deal成交，句意：这次我请客，下次你请。怎么样？--好的，一言为定。选D。
考点：考查交际用语