---He ______ for nearly twenty years.
A:When; has left
B:When; has been away
C:How long; has left
D:Ho w long; has been away
读下图,有关长江三角洲区域概况,不正确的是( )
我国当前正在实施是“十三五”规划,那么第一个五年计划时期是指( )