问题
选择题
John ___ such a thing about you. He never speaks ill of you behind your back.
A．can’t have said
B．might not have said
C．couldn’t say
D．mustn’t have said
答案
答案：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。