问题补充:
—Who telephoned you just now?
— don’t know. I was about to answer the phone when it .
A. rang up
B. rang off
C. hung on
D. rang back
答案:
A. rang up
(答案→)B. rang off
C. hung on
D. rang back
解析:考查短语辨析。rang up 打电话,rang off 挂断电话,hung on 稍等,别挂断,rang back 回电话,句意:刚才谁给你打电话了?不知道,我刚要接电话正在那时它挂断了。所以选B。