Only then the importance of my health.A. did I realizeB. had I realizedC. I realizedD. I h

问题补充：

Only then the importance of my health.

A. did I realize

B. had I realized

C. I realized

D. I had realized

答案：

(答案→)A. did I realize

B. had I realized

C. I realized

D. I had realized

解析：考查only的倒装句。当only放在句首的时候，且强调的是状语的时候，后面的主句使用部分倒装的形式。本题的only放在了句首，强调的是时间状语then，所以后面的主句使用部分倒装的形式。句意：只有在那个时候，我才意识到健康的重要性。故A正确。