As a result of（） — one of the sources of synonyms, gain the upper hand becomes the synonym of win.
A、borrowing
B、dialects and regional English
C、figurative and euphemistic use of words
D、coincidence with idiomatic expressions
【正确答案】：D
【题目解析】：本题考查同义词的来源。borrowing：借词；dialects and regional English：方言词；figurative and euphemistic use of words：比喻词和委婉语；coincidence with idiomatic expressions：与习语的巧合。gain the upper hand是一句习语，表示“赢；占上风”，与win含义相同，所以属于与习语的巧合。故D选项符合题意。
