Only after the woman had her own child ________ how difficult it was to be a mother.
A．she realizedB．had she realized
C．she had realizedD．did she realize
D

試題分析：句意：只有當(dāng)一個女人有了自己的孩子以后，她才認(rèn)識到做一個媽媽有多難。Only位于所修飾的從句之前，并放在句首時主句要倒裝，而且前面是過去時，所以后面要加助動詞did，故選D。
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