问题
选择题
Not until his father died _______ what his father really meant.
A．do they realize
B．did they realize
C．realized they
D．had they realized
答案
答案：B
题目分析：考查倒装句：直到父亲去世他才意识到父亲真的意味着什么。Not until+从句倒在句首，这句话用部分倒装句，根据句意：两个动作是同时发生，用一般过去式，选B。