问题
选择题
Only then ________ that he had lost a good chance of achieving his dream.
A．he realized
B．realized he
C．did he realize
D．will he realize
答案
答案：C
题目分析：句意：知道那时他才意识到他错过了一个实现梦想的好机会。时态应为过去时。Only then放在句首需要部分倒装。故选C.