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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