Ezra Miller showed face in public for the first time in a long time during "The Flash" premiere -- and just as promised ... they didn't answer many questions, and kept it moving.

The embattled actor -- who's been at the center of several arrests and scandals over the past year and change -- walked the red carpet Monday in Los Angeles ... where their new DC superhero film debuted in a highly-anticipated screening at the Ovation in Hollywood.

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