— 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
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B解析本题考查反义疑问句。情态动词 +have done 其后的反义疑问句，有表示过去的时间状语时，由主要动词决定用 did 、 was 获 were ，没有时间状语时借助于 have 。此题在对话中暗含了过去的时间状语，因此选 B 。