Three hundred years ___(be)a short time in sory.

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Three hundred years ___(be)a short time in sory.
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Three hundred years ___(be)a short time in sory.
Three hundred years ___(be)a short time in sory.

Three hundred years ___(be)a short time in sory.
is
years虽然是复数但是300 years在此是作为一个整体时间概念出现,所以做单数看.

is

Three hundred years is a short time in sory(sory 是什么?好像有错哦)

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is
时间,长度,金钱做主语,都是作为整体看,一律用单数