He must have finished the work by the end of last month, _______ he??
A.mustn'tB.hadn'tC.didn'tD.hasn't
B 
情態(tài)動詞must在此表示推測,反意疑問句是將must去掉,因句中有by the end of last month,故用過去完成時,反意疑問句也用hadn't來構成。
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