单选题 I wrote him a letter to show my appreciation of his thoughtfulness.
【正确答案】 D
【答案解析】[解析] 句意:我给他写了一封信,表达我对他体贴的感激之情。appreciation感激。gratitude感激。二者是同义词。achievement完成;成就。agreement同意,一致。attention注意力;关心。