After entering high school, he felt regretful for the time he had wasted playing puter games and studied hard to it.
A. sum up
B. take up
C. make up
D. hold up
网友回答
A. sum up
B. take up
(答案→)C. make up
D. hold up
解析：sum up概述；take up开始从事；make up弥补；hold up举起，阻挡。句意：在进入高中后，我感觉后悔的是我浪费了许多时间在玩电脑游戏，后来又在努力补上这段时间。根据句意故选C。