Question

It was playing computer games that cost the boy plenty of time that he ________ have spent doing his lessons．

[　　]

A．might

B．must

C．ought to

D．could

Answer 1

答案：C
解析：

　　ought to/should have done表责备，意为“应该做(而未做)”，might have done表示“可能已经做了”。must have done表示“一定做了，”could have done指“本来能做而没有做”。

　　根据句意“正是玩电脑游戏花了这男孩大量本应花在功课上的时间”可知应该用ought to。