这是一道考察虚拟语气的题.“如果我知道你是很严肃的,我是不会笑的.
与现在事实相反的虚拟语气 从句即if引导的句子用一般过去式（be用were）
主句用should+动词原形
与过去事实相反的假设,从句用 had done的形式
主句用should+have done
根据前面给出的句子中should not have laughed判断这是与过去事实相反的虚拟语气题,从句应该用had done 的形式所以选择答案C
I should not have laughed if I
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