The actor ________ basketball regularly for some years when he was young.         [ ]

A. was playing  

B. played      

C. has played      

D. had played

下列( )情况的动火属于一级动火。

A．在比较密封的地下室内进行用火作业

B．小型油箱等容器

C．登高焊、割作业

D．各种受压设备

E．在禁火区域内进行动火作业