It was playing computer games that cost the boy a lot of time that he __________ doing his lessons.

A. might have spent                           B. ought to have spent

C. must have spent                             D. could have spent

 It was playing computer games that cost the boy a lot of time that he __________ doing his lessons.

A. might have spent             B. ought to have spent

C. must have spent                  D. could have spent

_____ was playing computer games that cost the boy a lot of time. 　

A. This　　　　　 B. He　　 C. That　 D. It

_____ was playing computer games that cost the boy a lot of time. 　

A. This　　　　　 B. He　　 C. That　 D. It

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

    A. to have played            B. playing

    C. played                    D. having played