--- You look beautiful in that dress. Where did you get it?
--- .
A．What do you mean by that?
B．Please don’t mention it.
C．Thank you. It’s a present.
D．Oh, yes. It was cheap.
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解析：A．你的意思是什么呢? B．请别客气.C．谢谢你，这是一个礼物 D．哦，是的。这是便宜的.句意：你穿那件连衣裙很漂亮。你在哪儿买的？结合语境可知选C为最佳答案。