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early man-----(eat)raw meat before they----(know)how to use

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early man-----(eat)raw meat before they----(know)how to use fire
early man-----(eat)raw meat before they----(know)how to use
ate knew
早期的人在他们知道如何使用火之前吃生肉
再问: 谢了 ben----- (see)them -----(run) when he-----(walk) home
再答: ben saw them running when he was walking home see sb doing sth 看到某人在做什么
再问: 谢了 when he ----(write)a letter to him,she---(come)
再答: when he was writing a letter to him, she came in 当他正在写信的时候他进来了