问题补充:
Only when 1 was fourteenthe importance of study.
A. I realized
B. did I realize
C. had I realized
D. I had realized
答案:
A. I realized
B. did I realize
C. had I realized
D. I had realized
解析:
句意:只有当我14岁时,我才意识到学习的重要性。Only修饰状语when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。