——How long have you___China?——For three years .A.come back to B.returned C.left D.been away from ,为什么?

问题描述:

——How long have you___China?——For three years .
A.come back to B.returned C.left D.been away from
,为什么?

因为how long后面跟的肯定是时间段因此要用持续性v..ABC都是瞬间性v.所以选D!