Only after the woman had her own child how difficult it was to be a mother.A. she realize

问题补充：

Only after the woman had her own child how difficult it was to be a mother.

A. she realized

B. had she realized

C. she had realized

D. did she realize

答案：

A. she realized

B. had she realized

C. she had realized

(答案→)D. did she realize

解析：考查倒装句型。Only放在句首，且强调状语时，后面使用部分倒装。排除AC。感激时态，可以看出B错误，这里不需要使用过去完成时。句意：只有当她有了自己的孩子以后才意识到做妈妈是多么的困难。