—________did your uncle leave his hometown?—He________for ne
—________did your uncle leave his hometown?—He________for nearly twenty years.A.When; has left
—________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
我看好多答案第一个空都选“when”,我觉得应该是“haw long”,说明理由