I should not have laughed if I________you were serious.               (2013·江蘇，30)
A．thoughtB．would think
C．had thoughtD．have thought
C
解析　考查虛擬語(yǔ)氣。句意為：如果我當(dāng)時(shí)想到你是認(rèn)真的，我就不會(huì)笑了。由句意知，此句是與過(guò)去事實(shí)相反的虛擬語(yǔ)氣，故從句結(jié)構(gòu)為had done。
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