How time flies!three years （） really a short time. 该填什么（is；are；was；were）为什么

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How time flies!three years （） really a short time. 该填什么（is；are；was；were）为什么

is.三年作为一个整体的一段时间,不是说第一年很短,第二年也很短,所以用单数.一种判断,那3年在现在仍然很短,不是说以前那3年短,现在那3年就很长了.

is Three years作为一个整体,系动词用单数

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