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—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 beenB.can’t have been
C.oughtn’t to beD.should have been
B

试题分析: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。
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