—Mary’s got crazy and has been sent to the mental hospital. Did you tell her boss about th

问题补充：

—Mary’s got crazy and has been sent to the mental hospital. Did you tell her boss about that?

—Yes, but I her husband first.

A. can have told

B. should have told

C. need have told

D. must have told

答案：

A. can have told

(答案→)B. should have told

C. need have told

D. must have told

解析：考查情态动词用法。Can have done可能做了某事；Should have done本应该做某事，实际上却未做；need have done本需要做某事，实际上却未做；must have done一定做了某事；句意：—Mary疯掉了，已经被送到了精神病医院。你把这件事情告诉她的老板了吗?—是的。但是我本应该先告诉他丈夫的。BC两项是虚拟语气，表示对过去的虚拟。AD两项表示对过去情况的推测。