It was playing video games that took the boy too much time that he          have spent learning．

A．could B．must C．might D．ought to 

D

解析試題分析：句意：就是玩游戲花了這個(gè)男孩太多的本應(yīng)該學(xué)習(xí)的時(shí)間。Ought to have done“本應(yīng)該做卻沒有做”，could have  done“本來(lái)可能會(huì)做”，must  have done“過(guò)去一定會(huì)做”，might have done“本來(lái)可能會(huì)做”，所以D。
考點(diǎn)：考查情態(tài)動(dòng)詞

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