I donnot think three days is enough for such a trip.为什么是is呢?老师说three days 是...

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• 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...
• –Could you tell me how long __________ the book?--Three days.A.I can keep B.can I borrow C.I can borrow D.can I keep 这道题我看答案是选A,谁知道为什么呢?
• i went there for three days with my parents last month 为什么是用went 而不用have been、 she lived in China for more than than ten years but now she has returned to homeland.一样的,为什么用lived ,而不用had lived.我觉得有for都应该是用完成时.怎么区别呢.
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