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。