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(dòng)詞must在此表示推測(cè),反意疑問(wèn)句是將must去掉,因句中有by the end of last month,故用過(guò)去完成時(shí),反意疑問(wèn)句也用hadn't來(lái)構(gòu)成。
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