单选题 I ______ a taxi when it was raining.
A. used to take B. used to taking C. used to be taking D. was used to taking

【正确答案】 D
【答案解析】[解析] 本句意为：下雨的时候我习惯于打车。be used to doing意为“习惯于”，是固定搭配。