单选题 He did it ______ gratitude for everything she had done for him.
A. with B. in C. with regard to D. out of

【正确答案】 D

【答案解析】[解析] 考查介词词义辨析。句意：他那样做是出于感激她为他所做的一切。out of gratitude出于感激；with regard to关于。