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—I telephoned him twice and I couldn’t get through to him. 
—The line might have been out of order,     ?
A.don’t youB.wasn’t itC.do youD.hadn’t it
B

试题分析:考查反意问句:句意:--我给他打了两次电话都打不通。--线路有可能出了问题,是吗?might have done表示对过去情况的推测。表推测的情态动词的反意疑问句看有没有过去时间,因为第一句话中是过去时,所以反意问句也是过去时。故选B。
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