题目

train leaves at 6pm
the train leaves at 6pm.So I have to be at the station ( )5.40pm at the lastest.
A.by B.before
选A.是最迟到.为止的意思?那before为嘛不对

提问时间：2020-10-09

答案

楼上的回答不错.
the train leaves at 6pm.So I have to be at the station before 5.40pm.
the train leaves at 6pm.So I have to be at the station by 5.40pm at the lastest.
你可以体会下二者的差别.