I failed in the final examination last term and only then ______ the importance

游客2023-11-16  25

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 倒装句题。only在句首,句子倒装。否定词+助动词/be动词/情态动词+主语。因此选择D。
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