Three years后面系动词用单数还是复数?

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Threeyears后面系动词用单数还是复数?Threeyears后面系动词用单数还是复数?Threeyears后面系动词用单数还是复数?单数,不管是一年还是一百年,都用单数.如：Threeyears

Three years后面系动词用单数还是复数?
Three years后面系动词用单数还是复数?

Three years后面系动词用单数还是复数?
单数,不管是一年还是一百年,都用单数.
如：
Three years is a long time.
三年是一段很长的时间.

一般看成单数形式,表示一段时间,比如:
Three years is a long time.
有时候为了强调数量也把它看成复数形式,比如:
Three years were taken by him to do that.

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