48. (2018长沙)—Your coat fits you well.
—Thank you. I ________ it when I was on vacation.
A. have bought  B. buy   C. bought
48. C【解析】考查一般过去时。句意“你的外套很适合你。”“谢谢你。我度假的时候买的它。”when引导的时间状语从句，前后时态需保持一致，从句用一般过去时，主句也用一般过去时。故选C。