问题
选择题
Only when he met the girl his aunt introduced to him ____ that he had seen her before.
A．he realized
B．he did realize
C．realized he
D．did he realize
答案
答案：D
本题考查倒装句。only所修饰的副词、介词短语或状语从句放在句首时要用倒装语序,将相应的助动词放到主语之前。