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【题目】My mother (work) in the hospital for twenty years.

【答案】has;worked
【解析】句意:我妈妈在医院已经工作20年了。for+时间段,表示动作的延续,用现在完成时have+过去分词,主语mother是第三人称单数,助动词用has,所以答案是has worked。

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