题目内容

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
考查情态动词表推测的用法。Can表示推测用于疑问句或否定句中，can have done 是对过去事情的推测，句意：约翰关于你他不可能说那样的事。他从来不在你背后说坏话。所以选A。
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