I have no idea what _____ while I was asleep.
A．has happenedB．could happenC．had happenedD．happened
D

試題分析:考查動(dòng)詞時(shí)態(tài)。從語(yǔ)境可知發(fā)生的事情應(yīng)該是在說(shuō)話人睡覺(jué)期間，應(yīng)該用一般過(guò)去時(shí)，而C選項(xiàng)過(guò)去完成時(shí)需有過(guò)去的時(shí)間或過(guò)去的動(dòng)作做對(duì)照才可以使用， B選項(xiàng)表示將來(lái)可能發(fā)生，不合句意，故D選項(xiàng)正確。句意：我不知道當(dāng)我睡著的時(shí)候發(fā)生了什么事情。
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