单选题 The demand made by the workers is that their salaries ______ to cover the increased cost of living.

【正确答案】 B

【答案解析】[解析] 本题考查虚拟语气的用法。英语中的demand，advice，order等表示建议、命令、要求的词，后面要用虚拟语气，即用(should)+动词原形。