——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
网友回答
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。