If I______the challenges at that time, I might not have started my own business.

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问题 If I______the challenges at that time, I might not have started my own business.

选项 A、would know
B、have known
C、had known
D、will know

答案C

解析根据句意和主句中的might not have started可知，本句是对过去发生事情的假设，所以从句应用过去完成时，即谓语动词用“had+过去分词”的形式。故选C。

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