Greetings, [People [standing in the line]] to get to the theatre were cold and wet. = People who stood in the line to get to the theatre were cold and wet. 'Standing in the line' is a post-modifying participle clause, it describes the word 'people'.
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mona angelPeople .. in the line to get to the theater were cold and wet.to stand is intransitive in this context, that is, it can't take an object, so it has no passive form.
A) standing B)stood