初中英语yesterday when i got to the train station,i ---my ticket at the office

问题描述:

初中英语yesterday when i got to the train station,i ---my ticket at the office
A left
B had left
为什么?

B.因为把票忘记在办公室是在我去火车站之前的事,去火车站这件事又是在昨天,是个过去的时间,所以没拿票是过去的过去,用过去完成时.