问题补充:
It was playing video games that took the boy too much time that hehave spent learning.
A. could
B. must
C. might
D. ought to
答案:
A. could
B. must
C. might
(答案→)D. ought to
解析:句意:就是玩游戏花了这个男孩太多的本应该学习的时间。Ought to have done“本应该做却没有做”,could have done“本来可能会做”,must have done“过去一定会做”,might have done“本来可能会做”,所以D。