（单选题）
树不修不直，儿不教不才”、“遇良医得生，遇庸医致死”这说明（）
A外因是事物变化的根本原因
B外因是事物变化的根本
C外因是事物变化不可缺少的条件
D外因并不一定通过内因起作用
正确答案
答案解析
略
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