You can certainly leave the classroom as soon as your homework .
A. has done
B. has been done
C. will be done
D. will have been done
网友回答
A. has done
(答案→)B. has been done
C. will be done
D. will have been done
解析：在时间状语从句中可以用现在完成时表示将来，强调从句的动作发生在主句谓语所表示动作之前。