-I have bought a very beautiful postcard

-I have bought a very beautiful postcard
-I have bought a very beautiful postcard for mothers'day.
-Really?When___you___it?
A.do buy B.will buy C.did buy D.have bought
答案是c，我能理解，但是请问可以选D吗？
瞬时性动词也可以用在完成时啊，只是不能用在进行时，不是么？