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(2013·高考江苏卷)I should not have laughed if I________ you were

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(2013·高考江苏卷)I should not have laughed if I________ you were serious.
A.thought B.would think
C.had thought D.have thought
C

选C。句意:“如果我当时想到你是认真的,我就不会笑了。”根据主句中should not have laughed 可知,本句所讲的与过去事实相反。if引导非真实条件句表示与过去事实相反时,从句谓语结构为had done。