Mary ______ my letter; otherwise she would have replied before now.

A. has received

B. ought to have received

C. couldn't have received

D. shouldn't have received

根据民法通则及相关规定，对于代理人在代理权终止后的代理行为，下列哪些说法是正确的？（）

A.经过被代理人追认的，被代理人承担民事责任

B.未经被代理人追认的，行为人承担民事责任

C.第三人知道代理权已终止还与行为人实施民事行为给他人造成损害的，由第三人和行为人负连带责任

D.经过被代理人追认的，由行为人和被代理人各承担百分之五十的责任