Question

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

   A．might have spent    B．ought to have spent           C．must have spent    D．could have spent

Answer 1

B

解析:

本题考查的是虚拟语气的有关用法。Ought to / should + have +p.p表示“本来应该做却没有做到的事情”，有责备的含义。