——You didn’t invite Mary to the ball? —— her too?A. Must I inviteB. Should I have invited

问题补充：

——You didn’t invite Mary to the ball?

—— her, too?

A. Must I invite

B. Should I have invited

C. Must I have invited

D. Should I invite

答案：

A. Must I invite

(答案→)B. Should I have invited

C. Must I have invited

D. Should I invite

解析：考查情态动词。should have done本该做但事实上并未做。