It was playing computer games that cost the boy plenty of time that he ______ spent doing his lessons.
A．might haveB．should
C．ought to haveD．could
C
考查情態(tài)動詞。根據(jù)句子，指的是過去的情況，所以要用情態(tài)動詞加完成時態(tài)表過去本應(yīng)該做而實際沒做的事。might have done,本可以做某事；ought to have done本應(yīng)該做而實際沒做。句意：玩電腦游戲花費了這個男孩大量的時間，他本應(yīng)該把時間用在功課上。所以選C。
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