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Playing computer games for a long time is a _____ of time.

A. kill B. use C. cost D. waste

D 【解析】句意:玩电脑游戏很长时间是浪费时间。A. kill杀死;B. use 使用;C. cost花费;D. waste浪费。a waste of time浪费时间,结合句意,故答案为D。
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