2. 外语
  3. I failed in the final examination last term and only then______ the importance of studies.

I failed in the final examination last term and only then______ the importance of studies.

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问题 I failed in the final examination last term and only then______ the importance of studies.
选项 A、I realized
B、I had realized
C、had I realized
D、did I realize
答案D
解析 only位于句首时，谓语动词部分倒置。
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