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
be supposed to do sth.="should" do sth.理应做……根据下文得知:由于被事故耽搁而没能及时参加晚会。晚会已经举行了，不定式要用完成式。故正确答案为C。