【題目】I should not have laughed if I ______ you were serious.

A. thought B. would think

C. had thought D. have thought

【答案】C

【解析】

試題分析：句意：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，此句是與過去事實(shí)相反的虛擬語氣，可知從句結(jié)構(gòu)為had done。故選C。

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