问题补充：
单选题
Every hour and every minute ______precious to us because only six months are left for us to prepare for the college entrance examinationsA.will beB.areC.isD.were
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C解析考查主谓一致。every+ 单数可数名词 and every+ 单数可数名词做主语时，谓语动词用单数形式，根据语境所以选C。
