(单选题, )以下程序的输出结果是（ ） D = {"zhang":"China", "Jone":"America", "Natan":"Japan"} For k in d: print(k, end="")
A.ChinaAmericaJapan
B.zhang:China Jone:America Natan:Japan
C.“zhang””Jone””Natan”
D.zhangJoneNatan
正确答案是D