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  3. It was playing computer games that cost the boy plenty of time that he______doing his lessons.

It was playing computer games that cost the boy plenty of time that he______doing his lessons.

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问题 It was playing computer games that cost the boy plenty of time that he______doing his lessons.
选项 A、might have spent
B、must have spent
C、ought to have spent
D、could have spent
答案C
解析 考查情态动词。might have done意为“可能做过……”；must have done意为“一定做过……”；ought to have done意为“理应做……”；could have done意为“本来能做……而没有做”。句意为：“玩电脑游戏花去了大量他本该做作业的时间。”故选C项。
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