问题描述：
I donnot think three days is enough for such a trip.为什么是is呢?老师说three days 是...
I donnot think three days is enough for such a trip.为什么是is呢?老师说three days 是概念,不是指天数.但我不懂.求详解
I donnot think three days is enough for such a trip.为什么是is呢?老师说three days 是概念,不是指天数.但我不懂.求详解
问题解答：
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