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They must have finished the work by the end of last month, ______?
A.hadn’t theyB.mustn’t theyC.haven’t theyD.didn’t they
A

试题分析:句意:他们上个月的月底一定已经完成了这项工作,不是吗?当情态动词must表推测时,其反义疑问句要根据实际情况来判断,本题的时间状语是by the end of last month,应与过去完成时连用,还原一下本题应为:They had finished the work by the end of last month.故选C。
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