But sixty years_____things were quite different填ago 还是before理由

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But sixty years_____things were quite different
填ago 还是before
理由

ago 因为句子里的be动词是were她是are的过去式

ago

ago 用在时间段之后 before 用在时间点之前 例如 before 9 o'clock

理由
填ago是以前的意思