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"An" is used before a word that begins with a vowel while "A" is used before a word that begins with a consonant.
One international organization that begins with the letter 'u' is United Nations Children's Fund (UNICEF). Another organization is the United Nations.
The United Nations is an international organization that begins with the letter U.
The subordinate clause in your sentence begins with the word before.
If you are asking about Batman Begins, he was trained by the League of Shadows.
In the sentence, "Dolly must clean up her room before she goes out," the word that begins the subordinate clause is before. The subordinate clause is "before she goes out."
The cast of The Moment Before the Song Begins - 2013 includes: Starkey Flythe
order of importance
order of importance
order of importance