问题补充:
Only then how much damage had been caused.
A. had she realized
B. she realized
C. did she realize
D. she had realized
答案:
A. had she realized
B. she realized
(答案→)C. did she realize
D. she had realized
解析:这题考查倒装句的用法:only+副词 then,后面用部分倒装,即将助动词did放在主语前,句意是:只有那时他才知道造成多大的损失。选C。