They( ) supposed to get to the station before ten o'clock,but they don't appear now.用are还是were为什么?

They( ) supposed to get to the station before ten o'clock,but they don't appear now.用are还是were
为什么?

were 整个句子是个虚拟语气,本该来的却没来.

are 现在的事

edgarjiang是对的