We should ________ waste our valuable time playing puter games.If so, our grades will be raised ________.A.at a time; for a timeB.at no time; in no timeC.in time; on timeD.at times; at all time
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B解析本题考查time的相关短语。at a time每次;for a time一度;at no time任何时候都不;in no time立刻,马上;in time及时,最终;on time准时;at times有时候;at all time一直。考查句意:“我们任何时候都不应该把我们宝贵的时间花在打电脑游戏上。这样的话,我们的成绩很快就会提高。”那么当然应该选B项了。