Appositive clues are the phrases that give the meaning of the former word used in the sentence. Unlike novels, novellas can often be read in one sitting, is a sentence with appositive clues.
What are appositive clues?
Appositive clues are used in the vocabulary context that shows a phrase with a word followed by its meaning. The word and the meaning are separated by the commas.
The sentence, unlike novels, novellas can often be read in one sitting uses appositive clue as the novel is defined and is separated from the meaning using a comma.
Therefore, option a. unlike novels, novellas can often be read in one sitting uses appositive clue.
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