Topic: Miscellaneous (Others Question of English Grammer),

Best Answer Explained in Below-:

The question "What time does the train leave?" is structured to inquire about the specific moment or schedule at which the train departs. Among the given options, "D: does the train leave?" is grammatically correct and fits into standard English usage for this kind of inquiry.

Let's break down the options:

- Option A, "the train leaves?" lacks the necessary auxiliary verb "does," making it incorrect as a question.
- Option B, "leaves the train?" is nonsensical in this context, as it suggests the train is departing from something rather than asking about when it departs.
- Option C, "is the train leaving?" is a valid question, but it asks about the current action rather than the scheduled time of departure, which is not what the original question specifies.

Thus, option D is the only one that accurately uses the proper subject-verb order for asking about a future event in a straightforward manner, making it both grammatically correct and contextually appropriate. It directly addresses the timing aspect by using "does," which indicates a focus on the scheduled departure.