【题目】---Students should devote most of their time to studying rather than playing computer games.
---________. No pains, no gains.
A. Extremely B. Actually C. Obviously D. Exactly
在线课程【答案】D
【解析】
试题分析：A. Extremely非常，极其；B. Actually事实上；C. Obviously明显地；D. Exactly确实是，正是。句意：—学生们应该把多数时间用于学习而不是玩电脑游戏。—确实是，不劳无获。根据句意选D.