— Happy birthday!— Thank you! It’s the best present I for.A. should have wishedB. must ha

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A. should have wished
B. must have wished
C. may have wished
(答案→)D. could have wished
解析：考查情态动词+have done表推测用法。句意：“—生日快乐！—谢谢！这很可能是我希望得到的最好的礼物。”should have done“本应该做（但实际上未做），只表虚拟”；must have done“过去一定做过某事”；may have done“过去可能做过某事”；could have done“过去很可能做过某事”。后三个均可表推测，就可能性程度而言，must 最大，could 其次，may 更次之，might 最小。