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21) Nguồn gốc, động lực cơ bản của sự vận động phát triển là do:a) Sự thống nhất của các mặt đối lậpb) Sự đấu tranh của các mặt đối lậpc) Sự thống nhất và đấu tranh của các mặt đối lậpd) Sự mâu thuẫn của các mặt đối lập

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