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：句意：只有那个女人有了自己的孩子之后，她才意识到做一个母亲有多难。Only+状语置于句首，主句要用部分倒装，故排除A&C；由因为状语从句中使用了一般过去时，主句的时态要发生在从句之后，因此排除B，故答案选D。