until用于肯定句中,表示句子的动作一直截止到until短语所表示的时间为止.意为“直到……为止/在……之前”.但是在这种用法中,句子的谓语动词必须是持续性动词（非瞬间动词）.持续性动词有：work、live、last、love、like、stay、continue等.而leave离开是瞬间动词,所以不能用until.
by的意思为“到……为止/不迟于……”
题目的意思是：火车下午六点开,所以我最迟也不能迟于五点四十.
解释的很明白了,希望对你有所帮助.
The train leaves at 6;00 pm.So I have to be at the station__
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