They demanded that the books to the school library right away.
A. should return
B. be returned
C. were returned
D. returned
网友回答
A. should return
(答案→)B. be returned
C. were returned
D. returned
解析：考查固定结构。Demand当要求讲，后面的宾从要用should+do的虚拟语气，should可省，the books和return之间是动宾关系，用被动。所以选B。