---When shall we start the reconstruction of the historic building?
--- Not until our program by the authority.
A. will approve
B. will be approved
C. has approved
D. has been approved
网友回答
A. will approve
B. will be approved
C. has approved
(答案→)D. has been approved
解析：考查时态。句意：我们什么时候开始这个古建筑的重建？——直到我们的计划被当局批准后。可知下文描述的是在某个时间点前完成的动作，我们的计划是动作的对象，故用完成时态，被动语态，选D。