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

解析考查虚拟语气。if引导的非真实条件句，用虚拟语气，根据句意，是对过去事情的虚拟，从句用过去完成时，故选C。

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