The essay you wrote is excellent, which a rapid improvement on your recent work. A. illust

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A. illustrates
B. explains
(答案→)C. represents
D. municates
解析： 考查词义辨析，illustrates用图表等做出诠释，explains解释，represents代表，表明，municates交流，句意：你写的文章非常的优秀，表明了在最近的工作中你有快速的提高。故选C。