John ___ such a thing about you. He never speaks ill of you behind your back.
A．can’t have saidB．might not have said
C．couldn’t sayD．mustn’t have said
A
考查情態(tài)動(dòng)詞表推測(cè)的用法。Can表示推測(cè)用于疑問句或否定句中，can have done 是對(duì)過去事情的推測(cè)，句意：約翰關(guān)于你他不可能說那樣的事。他從來不在你背后說壞話。所以選A。
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