— did your uncle leave his hometown?
—He for nearly twenty years.
A. When; has left
B. When; has been away
C. How long; has left
D. How long; has been away
网友回答
A. When; has left
(答案→)B. When; has been away
C. How long; has left
D. How long; has been away
解析：when什么时候；how long多长；根据下文时间状语，将近二十年了。可知上文提问的是时间长短，下文描述的是从过去某时持续到现在的状态，故谓语动词用持续性动词，故选B。