问题补充:
I failed in the examination last term and only then the importance of studies.
A. I realized
B. I had realized
C. had I realized
D. did I realize
答案:
A. I realized
B. I had realized
C. had I realized
(答案→)D. did I realize
解析:句意:上学期期末考试我没考及格,只在那时我才意识到学习的重要性。Only修饰状语then位于句首时需使用部分倒装,本句的时态应使用一般过去式。