问题补充:
I failed in the job interview and only then the importance of learning English well.
A. I realized
B. I had realized
C. did I realize
D. had I realized
答案:
A. I realized
B. I had realized
(答案→)C. did I realize
D. had I realized
解析:句意;我工作面试时失败了,直到那时我才意识到学英语的重要性。因为前面用failed,所以这里也用过去式。在and后的分句中,only then放在句首句子应用部分到装。故选C。