The workers in the factory demanded that their pay by 20 percent.
A. be raised
B. would be raised
C. should arise
D. should be risen
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(答案→)A. be raised
B. would be raised
C. should arise
D. should be risen
解析：虚拟语气题。Demand “要求”后的宾语从句用should do 形式should可省；提高工资用动词raise所以答案为A。