I should not have laughed if I _________ you were serious.
A．thoughtB．would thinkC．had thoughtD．have thought
C

試題分析：句意：如果我認(rèn)為你是嚴(yán)肅的，我不會(huì)笑的。根據(jù)should not have laughed可知這是對(duì)過去事實(shí)的假設(shè)，因此if引導(dǎo)的條件狀語從句用過去完成時(shí)。故選C。
考點(diǎn)：
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