After the last lesson,all the other boys go home, but Tom an

After the last lesson,all the other boys go home, but Tom and Fred stay inthe classroom with their题目：After the last lesson,all the other boys go home. 这题答案是对的 可是原文中：但是Tom 和 Fred不是留在教室嘛?求解释 今天晚上考试的题目 30内速回