My daughter is going through an important stage she must learn to live independently(独立的) in her life.
A. where
B. which
C. what
D. when
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(答案→)A. where
B. which
C. what
D. when
解析：考察定语从句。本题定语从句的先行词是an important stage,后面定语从句的句子结构很完整，故使用关系副词where。When的先行词必须是时间。Which在句中作主语，宾语，或者表语；what不能引导定语从句。句意：我女儿真正经历一个重要的人生阶段，在这一阶段，她一定要学会在生活中要独立。故A正确。