【題目】Had they known that there was an explosion in Thailand，they second thoughts about traveling there.

A. may have B. could have

C. will have had D. might have had

【答案】D

【解析】考查情態(tài)動(dòng)詞。句意為：如果他們知道泰國(guó)會(huì)發(fā)生爆炸，對(duì)于去泰國(guó)旅行這件事他們也許會(huì)三思而行。由“Had they known”可知本句說(shuō)的是對(duì)過(guò)去的虛擬，主句中的謂語(yǔ)動(dòng)詞應(yīng)使用“should/would/could/might＋have done”的結(jié)構(gòu)。故選Ｄ。

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