tired of sleeping on the floor,a young man in teheran saved up for years to buy a real bed时态tired of sleeping on the floor,a young man in teheran saved up for years to buy a real bed为什么buy 要用原型而不用过去式

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tired of sleeping on the floor,a young man in teheran saved up for years to buy a real bed时态
tired of sleeping on the floor,a young man in teheran saved up for years to buy a real bed为什么buy 要用原型而不用过去式