单选题 Why didn't Mark and Dan go sailing together? [A] Because Mark was in some other place. [B] Because Dan was in some other place. [C] Because Dan asked his brother to go with Mark.
【正确答案】 B
【答案解析】[考点] 细节题 [解析] 从文中第1段第1句可知“Dan碰巧外出”。