问题补充:
Only then how much damage had been caused.
A. she realized
B. she had realized
C. had she realized
D. did she realize
答案:
A. she realized
B. she had realized
C. had she realized
(答案→)D. did she realize
解析:句意:就在那时她才意识到已经引起多么大的伤害。Only then放在句首句子应该用部分倒装,根据had been caused可知realize应该用过去式,故用D。