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In the sentence provided, the author uses a literary device to emphasize Johnny's fear. The literary device used in this sentence is a **simile**. A simile is a figure of speech that compares two different things using the words "like" or "as."
In this case, the author compares Johnny's appearance to that of a ghost and his eyes to those of an animal in a trap. By using the simile "as white as a ghost" and "like the eyes of an animal in a trap," the author vividly conveys Johnny's extreme fear and the intensity of his emotions to the reader.
Therefore, the correct answer to the question is **Simile**.
