问题补充:
It was playing computer games that cost the boy plenty of time that he spent doing his lessons.
A. might have
B. should
C. ought to have
D. could
答案:
A. might have
B. should
(答案→)C. ought to have
D. could
解析:考查情态动词。根据句子,指的是过去的情况,所以要用情态动词加完成时态表过去本应该做而实际没做的事。might have done,本可以做某事;ought to have done本应该做而实际没做。句意:玩电脑游戏花费了这个男孩大量的时间,他本应该把时间用在功课上。所以选C。