----I called him twicw and I couldn’t get through to him.
----The line might have been out of order,_____?
A．mightn’t itB．hadn’t itC．wasn’t itD．haven’t it
C

試題分析：考查反意問句：句意：--我給他打了兩次電話都打不通。--線路有可能出了問題，是嗎？might have done表示對過去情況的推測。表推測的情態(tài)動詞的反意疑問句看有沒有過去時間，因?yàn)榈谝痪湓捴惺沁^去時，所以反意問句也是過去時。故選C。
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