Swallows fly to the south before winter comes .中文,为什么用comes而不用will come ,或is coming,或Is going to come

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• Swallows fly to the south before winter comes .中文,为什么用comes而不用will come ,或is coming,或Is going to come
• Swallows fly to the south before winter_____这个填will come还是is coming还是comes 还是is going to come呀
• Swallows fly to the south before winter comes .中文,为什么用comes而不用will come ,或is coming,
• away waiter day bed,away和day划线ay,waiter划线ai,bed划线e.thank think there birthday划线都是th
• Swallows fly to the south before winter_____这个填will come还是is coming还是comes 还是is going to come呀