It was ____ computer games that cost the boy a lot of time _____ he ought to have spent on his lessons.

A. played; that　　　　　　　　　

B. playing; when

C. to have played; which　　　　　

D. playing; /

It was __________ computer games that cost the boy a lot of time he ought to have spent on his lessons．

 A. having played           B. to have played    

 C. playing                    D. played

It was __________ computer games that cost the boy a lot of time he ought to have spent on his lessons．

 A. having played        　 B. to have played    

  　 C. playing        　　 D. played

 It was __________ computer games that cost the boy a lot of time he ought to have spent on his lessons．

 A. having played              B. to have played        C. playing             D. played