It was playing computer games that cost the boy plenty of time he ____ doing his lessons.
A．might have spentB．ought to have spentC．must have spentD．could have spent
B
本題考查的是虛擬語氣的有關用法。Ought to / should + have +p.p表示“本來應該做卻沒有做到的事情”，有責備的含義。
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