I still don't know what__while I was away from home.A:has happened B:happened

问题描述:

I still don't know what__while I was away from home.A:has happened B:happened

B
while I was away 说明是过去时态

选 A
持续到现在,现在还不知道~

应该选B.只是对过去事实的陈述,没有持续到现在或对现在造成影响,所以必是B.

B 这句话表示过去发生的事情 不含有完成的意思