I should not have laughed if I you were serious.
A. thought
B. would think
C. had thought
D. have thought
网友回答
A. thought
B. would think
(答案→)C. had thought
D. have thought
解析:句意:如果我知道你是严肃的话我就不笑了。本句意思是当时不知道所以笑了,表示与过去事实相反,用“had thought”表示对过去情况的虚拟 。
【考点定位】考查虚拟语气。