Question

It was playing video games that took the boy too much time that he          have spent learning．

A．could

B．must

C．might

D．ought to

Answer 1

D

解析试题分析：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。
考点：考查情态动词