Question

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

1. A.
   might have spent
2. B.
   ought to have spent
3. C.
   must have spent
4. D.
   could have spent

Answer 1

B
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。