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

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

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

选 A
持续到现在,现在还不知道~

B
while I was away 说明是过去时态