I failed in the final examination last term and only then______ the importance o

游客2024-01-18 8

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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