The driver______the passengers off at the supermarket and then went to the next stop.
【正确答案】 C
【答案解析】解析：本题考查固定搭配。drop off是固定用法，意为“让…下车”。A项fall off“跌落”；B项sink off“沉没”；D项step off“步测(长度)”。代入题干，C项最符合，故选C。