问题
选择题
He must have finished the work by the end of last month, _______ he?
A．mustn't
B．hadn't
C．didn't
D．hasn't
答案
B
情态动词must在此表示推测,反意疑问句是将must去掉,因句中有by the end of last month,故用过去完成时,反意疑问句也用hadn't来构成。
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