问题描述：
Which train ...
应该是Which train leaves fo Shanghai?还是Which train leave for Shanghai?为什么
哪些问句动词要用原形?哪些问句第三人称不用原形?
应该是Which train leaves fo Shanghai?还是Which train leave for Shanghai?为什么
哪些问句动词要用原形?哪些问句第三人称不用原形?
问题解答：
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