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

游客2025-03-13 50

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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经过多次失败之后，他终于成功地发明了一种比已有的任何一种都好的自行车。Havingfailedmanytimes,hefinallysucceed