Only when Michael had his own child making a kid grow up healthily was too hard. A. he re

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A. he realized
B. had he realized
(答案→)C. did he realize
D. he had realized
解析：考查only的倒装句：only后面接状语，如副词，介词短语，状语从句，后面的主句是部分倒装，助动词，be动词或情态动词要放在主语前面，这句话only后面接的是when引导的时间状语从句，主句用倒装，句意：只有当迈克游客自己的孩子，他才意识到让孩子健康的成长太难了。主从句的时态是一致的，选C。