The victims of the accident demanded that the case at once.
A. would be looked into
B. should look into
C. be looked into
D. look into
网友回答
A. would be looked into
B. should look into
(答案→)C. be looked into
D. look into
解析：考查虚拟语气。Demand后从句用should加动词原形的虚拟语气，其中should可以省略，从句主语the case是动作对象，故用被动语态，选C。