
Diana P. answered 01/04/16
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Ahmed,
The correct answer is "had missed." This is known as past perfect and it represents the idea that something happened ("I got to the train station") before some other situation occurred in the past ("I realized I had missed my train").
In order for "have missed" to be correct, the sentence would need to be something like, "I have missed my train often" or "I have missed my train again!" This is the present perfect and it represents something that happened in the past at some unspecified time.

Ed M.
01/04/16