问题
选择题
— 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
答案：B
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 。