Several years has passed since we started our middle school

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Several years has passed since we started our middle school life.这里为什么是has passed?
several years不是复数形式吗,为什么不是用have passed

Several years 几年,属于时间作主语,英语中时间,数量,金钱作主语都看做第三人称单数.
例如：Ten years is a long time.
The number of the students in our school is about 2000.
Five dollars is not enough for him.

Several years has passed since we started our middle school how time flies several years --- since we started our middle How time flies!Several years ____since we started our middle -Twenty years has passed since we left school . -Yes, half o Three years has almost passed.We ____ in our school that we It has passed 10 years since we met last time. It ___ 6 years since we left middle school. Our school has changed greatly in the past several years. Five years has passed since we met last .为什么不用have passed? three years of middle school life has passed哪里错了 one and a half years (have/has) passed since we last meet. Two years (has) passed since we began studying English 请问为何不