—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

試題分析：考查情態(tài)動(dòng)詞。Can’t have done不可能做某事。句意：——你對(duì)你姐姐說了什么？我看到她在房間里哭�！豢赡苁俏业腻e(cuò)吧。當(dāng)我遇到她的時(shí)候，我只是向她問候了一下，其它什么也沒說。故B正確。
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