问题
选择题
----You _______ part in the party in time.
----Sorry I was delayed by the accident.
A．are supposed to take
B．have supposed to take
C．are supposed to have taken
D．supposed to take
答案
答案：C
考查固定用法。“你本应该及时参加晚会的。”“对不起，我被事故给耽搁了。”be supposed to do sth.“应该做某事”，相当于should do sth.，+have done意为“本应该做某事”。故选C。