—Alice，youaresupposed

问题详情：

—Alice，you are supposed________ part in the party in time.

—Sorry，but I had an unexpected visitor.

A．to take                          B．to have taken

C．to be taking                     D．taking

【回答】

B　[由下句可知，上句意：你理应及时参加晚会(但事实上没参加)；was/were supposed to do表示“本应该发生但实际未发生的事”，相当于be supposed to have done。]

知识点：非谓语动词

题型：选择题