my sister _______(stay)in Beijing for three months last year为什么用s_英语解答

my sister _______(stay)in Beijing for three months last year
为什么用stayed不用has been staying

人气：153 ℃　时间：2019-09-29 01:31:41

解答

last year暗示是去年的动作（现在不在北京了）.所以用过去时.has been staying表示一直（至今）待在北京.