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

问题补充：

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

A. he realized

B. had he realized

C. did he realize

D. he had realized

答案：

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。