题目内容
【题目】I failed in the final exams last term and only then _______the importance of study.
A. did I realize B. do I realize C. I do realize D. I did realize
【答案】A
【解析】
句意：上学期期末我考试不及格，直到那时我才意识到学习的重要性。根据I failed in the final exams last term可知是过去时态，排除B/C；根据only then要用部分倒装句；故选A
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