I still don't know what ( ) while I was away from home.A.had happened B.happened选哪个?另一个为什么不选?

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Istilldon''tknowwhat()whileIwasawayfromhome.A.hadhappenedB.happened选哪个?另一个为什么不选?Istilldon''tknowwhat()

I still don't know what ( ) while I was away from home.A.had happened B.happened选哪个?另一个为什么不选?
I still don't know what ( ) while I was away from home.A.had happened B.happened
选哪个?另一个为什么不选?

I still don't know what ( ) while I was away from home.A.had happened B.happened选哪个?另一个为什么不选?
B.while说明 I was away from home的动作和happen同时发生,所以不必用过去完成时.

选A。发生在过去的过去

A 我到现在还不知道在我不在家的时候发生了什么事。我已经回来了,而且回来这件事已经发生在过去了,那件事是在我回来前发生的,所以是过去的过去发生的,应该用过去完成时

A,过去完成时。。
发生在I was away from home,过去的过去就用过去完成时了