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

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。