He went there ________ and stayed there ________．A.three days ago;for three daysB.for three days;three days agoC.three days before;three daysD.before three days;three days before
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A解析解题指导：本题考查ago,before和for表示时间的用法。three days ago指went这一动作发生的具体时间，是过去发生的；for three days指stayed这一动作所持续的时间。