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请教个英语单复数的问题Jimhasbeenawayfor25days.Imisshimverymuch,youknow,25daysshort.这里应该填isn't还是aren't

题目详情
请教个英语单复数的问题
Jim has been away for 25 days.I miss him very much,you know,25 days ___ short.
这里应该填 isn't 还是 aren't
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答案和解析
Jim has been away for 25 days.I miss him very much,you know,25 days isn't short.
用单数,这边的twenty -five days看成是一个整体,用单数