题目内容
1938年5月至6月间，毛泽东发表《论持久战》的讲演，总结抗战10个月来的经验，集中全党智慧，系统地阐明了持久抗战的总方针。毛泽东科学地预测了抗日战争的发展进程，其中中国抗日战争取得最后胜利的最关键的阶段是______
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