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An appositive is a noun or noun phrase that renames the noun next to it. For example, if you said, "The boy raced ahead to the finish line," adding an appositive could result in "The boy, an avid sprinter, raced ahead to the finish line."<u>Appositives are used to reduce wordiness, add detail, and add syntactic variety to a sentence. ... Simple Sentence: Mrs. Green is a tough grader.:</u>
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I think it's B but not sure. :/
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I’d say it intensifies the speakers sense of urgency, because the modal verb must in this sense is used forcefully, as to imply there is little time and action must be taken due to this.
