—I telephoned him twice and I couldn’t get through to him.—The line might have been out of

问题补充：

—I telephoned him twice and I couldn’t get through to him.

—The line might have been out of order, ?

A. don’t you

B. wasn’t it

C. do you

D. hadn’t it

答案：

A. don’t you

(答案→)B. wasn’t it

C. do you

D. hadn’t it

解析：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。