They demanded that the books __________ to the school library right away．
A.should returnB.be returnedC.were returnedD.returned在线课程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。
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