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 |
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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 |
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