单选题 More than two hundred years ago the United States ______ from the British Empire and became all independent country.

【正确答案】 C

【答案解析】[解析] A项意为“下来、脱下”；B项意为“推翻、使降低”；C项意为“脱离、放弃”；D项意为“掉下、减少”。因此，C选项符合题意。