I have no idea what _____while I was asleep .A .has happened Bwas happened C.happened Dhad happened为神马选C呢?为神马ABD错的呢?

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Ihavenoideawhat_____whileIwasasleep.A.hashappenedBwashappenedC.happenedDhadhappened为神马选C呢?为神马ABD错的呢?

I have no idea what _____while I was asleep .A .has happened Bwas happened C.happened Dhad happened为神马选C呢?为神马ABD错的呢?
I have no idea what _____while I was asleep .A .has happened Bwas happened C.happened Dhad happened
为神马选C呢?为神马ABD错的呢?

I have no idea what _____while I was asleep .A .has happened Bwas happened C.happened Dhad happened为神马选C呢?为神马ABD错的呢?
首先排除 B 因为happen是不及物动词 不能有被动语态
因为名词性从句中的状语从句是 过去时 故 名词性从句的谓语 也必须是过去时 排除A
选项D 是过去完成时 表示动作发生在 从句之前 与句子意思不符 故 也错
所以答案是 C 一般过去时 表示动作是在状从期间 发生的