题目内容
Only when 1 was fourteen ______the importance of study.
A.I realized B.did I realize C.had I realized D.I had realized
B
解析:
B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。
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