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

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。