Not until I began to work ______ how much time I had wasted.A、have I realizedB、

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问题 Not until I began to work ______ how much time I had wasted.

选项 A、have I realized
B、I have realized
C、did I realize
D、I realized

答案 C

解析本题测试的是倒装句的用法。Not until引导的从句置于句首，主句中谓语需要部分倒装，即谓语动词的助动词提到主语前面。故选C。

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