Three years __(have) passed since they mat last and for time ,three years__(be)really a buy time.

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Three years __(have) passed since they mat last and for time ,three years__(be)really a buy time.

Three years __(have) passed since they mat last and for time ,three years__(be)really a buy time.
Three years __(have) passed since they mat last and for time ,three years__(be)really a buy time.

Three years __(have) passed since they mat last and for time ,three years__(be)really a buy time.
has,was

这里是三年,年份是复数(years都加S了说明可数)只有当表示抽象的时间(time)用单数 具体的时间 如果是复数形式 如three years, eight hours,etc.

have, is
three years三年,第一空强调个体,用复数;第二空强调整体,单数。