【題目】—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. do you

C. wasn’t it D. hadn’t it

【答案】C

【解析】

試題分析:句意：——我給他打了兩次電話，可是沒有接通。——線路可能出故障了，是嗎？情態(tài)動詞+have done表示對過去的推測判斷，后面的反義問句用一般過去時，故答案選C。

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