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情景对话题!speaker A:when does the next train leave speaker B:you

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情景对话题!
speaker A:when does the next train leave speaker B:you've just missed one by 5 minutes .( ) ,so you'll have to wait a while .A.trains leave every 50 minutes B.trains leave within 50 minutes 请问为什么要选A呢?请详讲
对话将的是一个人刚好错过了一班车,只是差了5分钟.每50分钟一班车,所以他要等一段时间了.A选项是说明火车每50分钟一趟的客观事实.B选项火车(复数)50分钟内发车.如果用单数,The next train leaves within 50 minutes 就对了 所以选A