By the time the soldiers arrived, the building ________．

By the time the soldiers arrived, the building ________．

A.has destroyed

B.has been destroyed

C.had been destroyed

D.had destroyed

答案及解析： C

解析：

by the time后面的从句用的是一般过去时，主句用过去完成时；

the building是被毁坏的，所以要用被动语态。