John such a thing about you. He never speaks ill of you behind your back.A. can’t have sa

问题补充：

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. can’t have said

B. might not have said

C. couldn’t say

D. mustn’t have said

解析：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。