Answer:
The Strophe 2 is the speaker, saying it to the rest of the chorus, when the chorus were addressing Oedipus's fate
The addressee is Oedipus.
The significance is that the Chorus are saying that anyone who believes they are as high as the immortal gods will be punished by an inevitable fate, this follows in the wake of Oedipus's pride and haughtiness and subsequent punishment.
Explanation:
Oedipus let his pride stop him from listening to the truth and he was haughty all through the play, so the chorus discussed his fate.
This extract was in reference to him, telling him that the punishment for his crime of haughtiness and pride, and his assumption that he is equal to the gods is inevitable. A fate which he accepted by blinding his own eyes.
Antecedent of a pronoun is a word that the pronoun refers to, or replaces. So, in this sentence, we are looking for the antecedent of the pronoun IT. The pronoun IT replaces the noun Chicago, which means that the word Chicago is the antecedent of the pronoun IT.
IT provides the best opportunity, meaning that Chicago does that.
Heres a definition I found
look for or discover a meaning that is hidden or implied rather than explicitly stated
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