The train____ arrive at 11: 30. but it was an hour late.

The train____ arrive at 11: 30. but it was an hour late.
A、would suppose
B、was supposed to
C、is supposed to
D、supposed to
【正确答案】：B
【题目解析】：【考点点击】本题考查be supposed to的用法。【要点透析】当 be supposed to的主语是物时,表示“本应,本该…”,用于表示某事本应该发生但却没有发生。又由后面的was可知,应用过去体,故选B。