---I left my handbag on the train, but luck

---I left my handbag on the train, but luckily someone gave it to a railway official.---How unbelievable to get it back! I mean, someone ______ it.A.will have stolenB.might have stolenC.should have stolenD.must have stolen

B解析本题考查气态动词。might have done“可能已经……”，表示对过去发生之事的不太肯定的推测，符合题意。will have done表示将来完成时；should have done本应该做某事但实际未做；must have done表示对过去发生之事的肯定推测。句意：——我把手提包忘在了火车上，但幸运的是有个人把它交给了铁路
部门的一名官员。——还能找回来多么令人难以置信！我的意思是，有人原本可能把它偷
走的。

正好我需要