题目

 Realizing he had wasted much of his precious time, the boy decided to work hard to _____    his lost time.   A. make up for          B. keep up with             C. catch up with           D. make use of 答案：A 有人问一位老师：他所教的班级有多少学生？老师说：“我们这节课是体育活动课，一半的学生在玩篮球，四分之一的学生在踢足球，七分之一的学生在打乒乓球，还剩不足6位学生在操场踢毽球．”如果假设这个班级有x名学生，请你根据题意列出不等式．