__did your aunt leave China?--She has been away for three years .Awhen B How long 选哪,原因

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__didyourauntleaveChina?--Shehasbeenawayforthreeyears.AwhenBHowlong选哪,原因__didyourauntleaveChina?--Sh

__did your aunt leave China?--She has been away for three years .Awhen B How long 选哪,原因
__did your aunt leave China?--She has been away for three years .Awhen B How long 选哪,原因

__did your aunt leave China?--She has been away for three years .Awhen B How long 选哪,原因
_did your aunt leave China?--She has been away for three years .Awhen B How long
选A
因为后面加的是瞬间动词,所以不能用how long这一表示一段时间的词来提问

B
后面的答案是for three years,一段时间,所以用how long。

一定选A
leave在英语中称为瞬间动词(也称非延续性动词),不能与how long 连用,只能与when连用。