it.ten years sinse he left the army A has gone Bwent Cwill Dhas been 为什么
问题描述：
it.ten years sinse he left the army A has gone Bwent Cwill Dhas been 为什么
答
Dhas been
从since可知应用过去完成时,排除B和C；has gone 表动作,has been 表状态