The effect of the repetition of "past" actually does the following: It characterizes Juliet as someone focused on what happened before.
Repetition is actually known to be a literary device that restates words or phrases two or more times in a written work or speech. Words are repeated in close proximity in order to show repetition taking place. Repetition is usually done for emphasis.
We can see that the repetition of "past" by Juliet actually shows that Juliet is characterized as someone focused on what happened before.
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