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:only + 状语 / 状语从句位于句首时,句子/ 主句要用部分倒装。将谓语的一部分(即情态动词、系动词或助动词)提到主语前的称为部分倒装。如句中没有情态动词、助动词或系动词,谓语只是一个实义动词,要在主语前加助动词do,does或did,主语后的实义动词用原形。