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

【答案】has;worked
【解析】句意:我媽媽在醫(yī)院已經(jīng)工作20年了。for+時間段,表示動作的延續(xù),用現(xiàn)在完成時have+過去分詞,主語mother是第三人稱單數(shù),助動詞用has,所以答案是has worked。

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