The main road for repairs, so we had to change the route to the downtown.
A. is being closed
B. has been closed
C. was to be closed
D. had been closed
网友回答
A. is being closed
B. has been closed
C. was to be closed
(答案→)D. had been closed
解析：考查时态。根据句意可知：主干道已经被关闭在修，根据时态故用过去完成时，选D。