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

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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引导的倒装句。当Only放在句首，且强调状语的时候，后面的主句使用部分倒装的形式，本题中的only放在了句首，强调的是时间状语从句when Michael had his own child。故后面的主句使用了部分倒装的形式，故C正确。