问题补充:
Only when he got there how much damage had been caused.
A. be realized
B. he had realized
C. had he realized
D. did he realize
答案:
A. be realized
B. he had realized
C. had he realized
(答案→)D. did he realize
解析:当only置于句首,强调状语成分的时候,主句用部分倒装的形式。故选D。句意:只有当他到达了那里,他才意识到导致的损失有多大。