Mary wants to know_____________________....

Mary wants to know_____________________.

A. where does the train leave

B. when the train leaves

C. when does the train leaves

D. when the train leave

B 【解析】试题分析：句意为：玛丽想知道火车什么时候启动。根据语境并结合选项可知，这是一个带疑问词的宾语从句，从句应用陈述句语序。因此从句的主语为“the train”，属于第三人称单数，根据主谓一致原则，动词也应用第三人称单数形式。结合选项可知应选B。考点：考查宾语从句的时态及语序。

考点分析：

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