单选题 They demanded that the government _______all political prisoners in the next two days. 
【正确答案】 A
【答案解析】考查虚拟语调在宾语从句中用法。在suggest,demand,insist等动词后宾语从句中,谓语动词应为" should十动词原形”,should可省略,A符合题意。