问题
选择题
—What did you say to your sister? I saw her crying in the room.
— It _________ my fault. I just said hello to her when I met her, nothing else.
A．must have been
B．can’t have been
C．oughtn’t to be
D．should have been
答案
答案：B
题目分析：考查情态动词。Can’t have done不可能做某事。句意：——你对你姐姐说了什么？我看到她在房间里哭。——不可能是我的错吧。当我遇到她的时候，我只是向她问候了一下，其它什么也没说。故B正确。