did your uncle leave his hometown ? He for nearly 20years .A. When has leftB. When h

问题补充：

did your uncle leave his hometown ?

He for nearly 20years .

A. When , has left

B. When , has been away

C. How long , has left

D. How long , has been away

答案：

A. When , has left

(答案→)B. When , has been away

C. How long , has left

D. How long , has been away

解析：句意：你的叔叔什么时间离开他的家乡的？他离开有近了。How long ,多久提问一段时间，与它连用的要么是可延续性的动作，要么是延续性的状态。根据leave非延续性动作，可知用when提问。for nearly 20years近，一段时间，leave对应的延续性状态是be away.故选B。