问题
选择题
They demanded that the books ______ to the school library right away.
A．should return
B．be returned
C．were returned
D．returned
答案
答案：B
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。