单选题
I should not have laughed if I ________ you were serious.
A、
thought
B、
would think
C、
had thought
D、
have thought
【正确答案】
C
【答案解析】
【解析】句意：如果我那时想到你是认真的，我就不会笑了。 此题考查与过去事实相反的虚拟语气。If从句使用过去完成式，主句使用would/should have done. 故正确答案：C
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