-----You _____ here in time.----Sorry,I was held up by the accident.Aare supposed to have arrived
问题描述：
-----You _____ here in time.----Sorry,I was held up by the accident.Aare supposed to have arrived
B.are supposed to arrive C.have supposed to arrive D.supposed to arrive
答
选A,不定式用了完成时表明动作先发于are的时间；
B.中to arrive指将来的时间
C.have supposed to arrive 是主动语态,错误
D.supposed to arrive 是主动语态,错误还是有点搞不清A和B 的区别，能详细讲一下吗？谢谢例如：I have a lot of work to do.这句话中的to do就表示将来要发生的动作，暗含了将来时间的意思。而to have done则表示动作已经完成了。