Twenty years ___long for us but only a short time in human history A is B are Cwas Dwere

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Twenty years ___long for us but only a short time in human history A is B are Cwas Dwere
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Twenty years ___long for us but only a short time in human history A is B are Cwas Dwere
Twenty years ___long for us but only a short time in human history A is B are Cwas Dwere

Twenty years ___long for us but only a short time in human history A is B are Cwas Dwere
Twenty years ___long for us but only a short time in human history A is B are Cwas Dwere
选A
twenty years看成一个整体
谓语动词用单数
又因为说的是一个事实
所以用一般现在时

用 is ,因为Twenty years 是一个整体

A.is
一段时间以及金钱要看做整体
当做单数形式来处理
如10 years,5 days,6 hours,50 dollars
都要用is
而句子意思是 二十年对我们而言很长,而在人类历史上很短。
亲 希望有帮助~~