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

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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。