单选题 The driver stopped his car so abruptly that he was hit by the cab behind him.
【正确答案】 C
【答案解析】abruptly突然地,唐突地。四个选项:impolitely无礼地,没规矩地;violently猛烈地,激烈地,极端地;suddenly突然地;maladroitly不灵巧地。